- Synthesis and characterization of low-birefringent crosslinkable fluorinated poly(arylene ether sulfide)s containing pendant phenyl moiety
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Fluorinated poly(arylene ether sulfide) (FPAESI) and ethynyl-terminated fluorinated poly(arylene ether sulfide) (E-FPAESI) were synthesized via step-growth polymerization from prepared dihydroxy monomer and pentafluorophenylsulfide, then E-FPAESI was foll
- Lee, Kwan-Soo,Kim, Jae-Pil,Lee, Jae-Suk
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Read Online
- NON-LINEAR CHROMOPHORE, PHOTOREFRACTIVE COMPOSITE COMPRISING THE SAME AND PHOTOREFRACTIVE DEVICE
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The present invention relates to a non-linear optical dye, to a photorefractive composite comprising the same, and to a photorefractive device and, more specifically, to a non-linear optical dye with improved response speed to an applied electric field by controlling a molecular structure, to a photorefractive composite comprising the same, and to a photorefractive device. The non-linear optical dye according to the present invention has an alkyl group or an alkoxy group having 1 to 10 carbon atoms.
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Paragraph 0084-0087
(2021/02/05)
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- Compound containing fused heterocycle structure, application of compound and organic electroluminescent device
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The invention relates to the field of organic electroluminescent devices, and discloses a compound containing a fused heterocycle structure, an application of the compound and an organic electroluminescent device. The compound has the general formula structure shown in the formula (I); the compound has a high glass transition temperature, a high decomposition temperature and a high refractive index; and when the compound is applied to a covering layer on a device, the light extraction efficiency of the cathode can be improved, so that the luminous efficiency of the device is improved, and the service life of the device is prolonged.
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Paragraph 0139-0141; 0145-0147
(2021/05/05)
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- Screening metal-free photocatalysts from isomorphic covalent organic frameworks for the C-3 functionalization of indoles
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The visible-light-driven organic transformation using two-dimensional covalent organic frameworks (2D-COFs) as metal-free heterogeneous photocatalysts is a green and sustainable approach, and it has gained a surge of interest by virtue of the photosensitizer's high crystallinity, abundant porosity, outstanding stability, excellent light-harvesting ability and tunable structure. However, the guiding principle for designing, constructing and selecting COF-based photocatalysts has not been put forward so far. Herein, we contribute a fascinating strategy to guide the acquisition of excellent framework photocatalysts, which is to screen them from a series of isomorphic COFs. As a proof of concept, three new isomorphic pyrene-based 2D-COFs (COF-JLU23, COF-JLU24 and COF-JLU25) with variable linkers were successfully synthesized. In addition to having similar crystallinity and porosity with the same pore size and shape, their absorption, emission, bandgap, energy level, transient photocurrent response and photocatalytic activity could be easily adjustedviaconfiguring different linkers in frameworks. Indeed, COF-JLU24 with electron donor-acceptor characteristics exhibited the best photocatalytic activity among the three isomorphic COFs for C-3 functionalization reactions of indoles, even better than that of the metal-free photocatalyst g-C3N4. More importantly, the screened COF-JLU24 as a metal-free photocatalyst still displayed extensive substrate adaptability and excellent recyclability. We anticipate that this strategy will become a robust rule of thumb for fast access to COF-based photocatalysts. In addition, we still highlight that the present study broadens the applied frontier of COF-based photocatalysts.
- Chen, Xiong,Feng, Xiao,Han, Songjie,Li, Chunzhi,Li, He,Li, Ziping,Liu, Xiaoming,Shao, Pengpeng,Xia, Hong
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supporting information
p. 8706 - 8715
(2020/05/16)
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- Synthesis of a triethylene glycol-capped benzo[1,2-c:4,5-c']bis[2]benzopyran-5,12-dione: A highly soluble dilactone-bridged p-terphenyl with a crankshaft architecture
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3,10-Bis(triethylene glycol)benzo[1,2-c:4,5-c']bis[2]benzopyran-5,12-dione has been synthesized as an example of a dilactone-bridged p-terphenyl with a C2h crankshaft architecture that exhibits significant fluorescence. Lactone-bridged rotation
- Dressler, Justin J.,Charlesworth-Seiler, Eva M.,Dahl, Bart J.
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- Synergistic Effect of Covalent Bonding and Physical Encapsulation of Sulfur in the Pores of a Microporous COF to Improve Cycling Performance in Li-S Batteries
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Lithium-sulfur batteries stands out as a promising technology for energy storage owing to a combination of favorable characteristics including a high theoretical gravimetric capacity, energy density, inexpensive character, and environmental benignity. Covalent organic frameworks (COFs) are a rapidly developing family of functional nanostructures which combine porosity and crystallinity, and which have been already used in these kinds of batteries to build sulfur electrodes, by embedding sulfur into porous COFs in order to enhance cycle lifetimes. In this contribution, this is taken one step forward and a COF endowed with vinyl groups is used, in order to graft sulfur to the COF skeleton through inverse vulcanization. The main aim of the article is to show the synergistic effect of covalent bonding and physical encapsulation of sulfur in the pores of the COF in order to alleviate the fatal redox shuttling process, to improve the cycling performance, and to provide faster ion diffusion pathways. In addition, it is shown how the material with covalently-bound S provides better electrochemical performance under demanding and/or changeable charge conditions than a parent analogue material with sulfur physically confined, but without covalent linkage.
- Royuela, Sergio,Almarza, Joaquín,Manche?o, María J.,Pérez-Flores, Juan C.,Michel, Enrique G.,Ramos, María M.,Zamora, Félix,Ocón, Pilar,Segura, José L.
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supporting information
p. 12394 - 12404
(2019/09/06)
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- Bromine formation in solid NaBr/KNO3 mixture and assay of this reaction via bromination of activated aromatics
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Bromine formation in the mixture of solid NaBr and KNO3 was observed and the process was studied in different acidified organic solvent–water mixtures by monitoring the bromination of acetanilide and other compounds, containing activated aromatic substituents. This assay is based on fast bromination reaction of these aromatic compounds, as differently from the assay of Br2, the brominated aromatics can be easily determined by conventional gas chromatography–mass spectrometry (GC–MS) methods. It was found that bromine was generated autocatalytically on the surface of salt crystals and the reaction was characterized by a lag period, the duration of which depended on reaction conditions, and importantly on the type of the organic solvent in the reaction mixture. As the bromine formation could be easily controlled by reaction conditions, it was suggested that the studied reaction might have practical applications as an environmentally friendly and economically feasible bromination method. It was also shown that the bromination of aromatics followed the mechanism of classical electrophilic aromatic substitution reaction.
- Rahu, Ida,Keki?ev, Ott,J?rv, Jaak,Burk, Peeter
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p. 2893 - 2898
(2018/08/23)
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- Covalent organic frameworks: Efficient, metal-free, heterogeneous organocatalysts for chemical fixation of CO2 under mild conditions
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The cycloaddition of CO2 to epoxides to form cyclic carbonates is very promising and does not generate any side products. Metal-free, heterogeneous organocatalysts offer an environmentally friendly alternative to traditional metal-based catalysts. Herein two triazine-based covalent organic frameworks (COF-JLU6 and COF-JLU7) were successfully synthesized under solvothermal conditions. The structural and chemical properties of COFs were fully characterized by using powder X-ray diffraction analysis, structural simulation, Fourier transform infrared spectroscopy, 13C solid-state NMR spectroscopy, electron microscopy, thermogravimetric analysis and nitrogen adsorption. The two COF materials combine mesopores, high crystallinity and good stability, as well as a large number of hydroxy groups in the pore walls. They possess a high Brunauer-Emmett-Teller (BET) specific surface area up to 1390 m2 g-1 and a large pore volume of 1.78 cm3 g-1. The COF-JLU7 displays a high CO2 uptake of 151 mg g-1 at 273 K and 1 bar. Importantly, COF-JLU7 was found to be a highly effective catalyst to convert CO2 into cyclic carbonate through the cycloaddition reaction with epoxides under mild conditions. The effect of reaction parameters, such as reaction temperature, reaction time and CO2 pressure, on the catalytic performance was also investigated in detail. Moreover, the new framework-based catalyst can be recovered and reused five times without a significant loss of catalytic efficiency.
- Zhi, Yongfeng,Shao, Pengpeng,Feng, Xiao,Xia, Hong,Zhang, Yumin,Shi, Zhan,Mu, Ying,Liu, Xiaoming
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supporting information
p. 374 - 382
(2018/01/12)
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- Stack the Bowls: Tailoring the Electronic Structure of Corannulene-Integrated Crystalline Materials
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We report the first examples of purely organic donor–acceptor materials with integrated π-bowls (πBs) that combine not only crystallinity and high surface areas but also exhibit tunable electronic properties, resulting in a four-orders-of-magnitude conductivity enhancement in comparison with the parent framework. In addition to the first report of alkyne–azide cycloaddition utilized for corannulene immobilization in the solid state, we also probed the charge transfer rate within the Marcus theory as a function of mutual πB orientation for the first time, as well as shed light on the density of states near the Fermi edge. These studies could foreshadow new avenues for πB utilization for the development of optoelectronic devices or a route for highly efficient porous electrodes.
- Rice, Allison M.,Dolgopolova, Ekaterina A.,Yarbrough, Brandon J.,Leith, Gabrielle A.,Martin, Corey R.,Stephenson, Kenneth S.,Heugh, Rebecca A.,Brandt, Amy J.,Chen, Donna A.,Karakalos, Stavros G.,Smith, Mark D.,Hatzell, Kelsey B.,Pellechia, Perry J.,Garashchuk, Sophya,Shustova, Natalia B.
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supporting information
p. 11310 - 11315
(2018/08/11)
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- Covalent organic frameworks as metal-free heterogeneous photocatalysts for organic transformations
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Two-dimensional covalent organic frameworks (2D-COFs) are excellent candidates for photocatalytic organic transformations due to their periodic columnar π-arrays and ordered nanochannels. Here, we present a novel 2D-COF that features permanent porosity wi
- Zhi, Yongfeng,Li, Ziping,Feng, Xiao,Xia, Hong,Zhang, Yumin,Shi, Zhan,Mu, Ying,Liu, Xiaoming
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supporting information
p. 22933 - 22938
(2017/11/22)
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- Aromatic diboron ester convenient synthesis method suitable for large-scale production
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The invention discloses an aromatic diboron ester convenient synthesis method suitable for large-scale production. A bibromo substrate serves as the raw material, and a metal catalyst and a reaction reagent are added under participation of alkali and bis(pinacolato)diboron for a coupling reaction, wherein reaction temperature is 70-100 DEG C, and the molar ratio of bis(pinacolato)diboron to the bibromo substrate is 1:10-10:1; after the reaction ends, diatomite is used for filtering, an organic solvent is removed, then re-crystallization and extraction are conducted, and a finished aromatic diboron ester product is obtained. The synthesis method is simple, production cost is low, and by-products, such as waste silica gel and excessive waste solvents, which are not environmentally friendly are not generated. The product is purified through the re-crystallization method, the product only needs to be crystallized and stay overnight at low temperature, a large number of solvents do not need to be consumed, workloads are reduced, purification efficiency of the product is also improved, large-scale industrial production is facilitated, and the reaction yield can reach as high as 93.6%.
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Paragraph 0012; 0018; 0022
(2017/07/01)
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- Process Development and Scale-up of Fully Synthetic Tetracycline TP-2758: A Potent Antibacterial Agent with Excellent Oral Bioavailability
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Process research and development of the fully synthetic broad spectrum tetracycline TP-2758, with a chiral pyrrolidine side chain at the C-8 position, is described. The process utilizes two key intermediates, 7 and 10, in a convergent approach that allows for manufacturing of sufficient quantities of API to supply preclinical and early clinical development. The pyrrolidine moiety was introduced into the left-hand piece (LHP) 10 with high enantioselectivity using Ellman's sulfinamide chemistry, and the absolute configuration was confirmed by X-ray crystal structure analysis.
- Zhang, Wu-Yan,Sun, Cuixiang,Hunt, Diana,He, Minsheng,Deng, Yonghong,Zhu, Zhijian,Chen, Chi-Li,Katz, Christopher E.,Niu, John,Hogan, Philip C.,Xiao, Xiao-Yi,Dunwoody, Nicholas,Ronn, Magnus
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p. 284 - 296
(2016/03/04)
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- Covalent organic frameworks as pH responsive signaling scaffolds
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A β-ketoenamine based covalent organic framework, COF-JLU4, was synthesized by condensation of 2,5-dimethoxyterephthalohydrazide with triformylphloroglucinol under solvothermal conditions. This COF has strong crystallinity, good porosity, photoluminescence properties and wettability for water. It can serve as the first COF-based fluorescent pH sensor in aqueous solutions.
- Zhang, Yuwei,Shen, Xiaochen,Feng, Xiao,Xia, Hong,Mu, Ying,Liu, Xiaoming
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supporting information
p. 11088 - 11091
(2016/09/19)
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- Diverse structures of metal-organic frameworks: Via a side chain adjustment: Interpenetration and gas adsorption
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Three new coordination polymers have been synthesized based on three linear pyridine ligands with different side chains and one flexible V-shaped dicarboxylate co-ligand: {[Co(L1)0.5(sdb)]}n (1), {[Co(L2)0.5(sdb)]·1.5H2O}n (2) and {[Co(L3)0.5(sdb)]·2DMF}n (3) (L1 = E,E-2,5-dioctyloxy-1,4-bis-[2-pyridin-vinyl]-benzene; L2 = E,E-2,5-dibutoxy-1,4-bis-[2-pyridin-vinyl]-benzene; L3 = E,E-2,5-dimethoxy-1,4-bis-[2-pyridin-vinyl]-benzene; H2sdb = 4,4′-sulfonyldibenzoic acid). Complexes 1-3 are 4-connected sql nets with a point symbol of {44·62}. The interpenetration forms and porosity of frameworks have been well controlled by side chain prolongation. A larger steric hindrance for the pendant -OnOct and -OnBut groups leads to a larger repulsive force between the layers and effective construction of inclined polycatenations. A smaller steric hindrance for the pendant -Me group leads to the formation of a parallel stacked network. Therefore, compounds 1 and 2 feature 3D structures with inclined polycatenation (2D + 2D → 3D); compound 3 exhibits a non-interpenetrated 2D + 2D → 2D parallel stacked network. These complexes have been characterized by single crystal X-ray diffraction, infrared spectroscopy, thermogravimetry, elemental analysis, and powder X-ray diffraction measurements. In addition, the gas adsorption properties of the compounds have also been explored.
- Shen, Kang,Qin, Ling,Zheng, He-Gen
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supporting information
p. 16205 - 16210
(2016/10/31)
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- Synthesis of dilactone bridged terphenyls with crankshaft architectures
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Three highly fluorescent dilactone bridged terphenyls with crankshaft architectures have been synthesized. This general class of compounds is relatively unexplored. These compounds have been characterized by fluorescence and UV-vis spectroscopy. For all three compounds, a direct correlation between the rigidity of the terphenyl system and the strength of absorption and emission of light has been observed. Preliminary studies have indicated that compounds with this architecture have the potential to be useful as pH-driven molecular switches and/or sensors with instant fluorescence attenuation at high pH values.
- Dressler, Justin J.,Miller, Sarah A.,Meeuwsen, Brian T.,Riel, Asia Marie S.,Dahl, Bart J.
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supporting information
p. 283 - 292
(2015/02/02)
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- Multigram synthesis of bis[(trimethylsilyl)ethynyl]benzenes suitable for post-polymerization modification
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Novel substituted bis[(trimethylsilyl)ethynyl]benzenes have been prepared as versatile building blocks for organic functional materials. The resulting effects of replacing sulfur by selenium and tellurium on photophysical and electrochemical properties ha
- Gl?cklhofer, Florian,Lumpi, Daniel,St?ger, Berthold,Fr?hlich, Johannes
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supporting information
p. 2229 - 2232
(2014/06/09)
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- A mild oxidation of deactivated naphthalenes and anthracenes to corresponding para-quinones by N-bromosuccinimide
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A new method to synthesize 1,4-naphthoquinone and 9,10-anthraquinone from naphthalene and anthracene functionalized with either -CHO or -COOH groups, using N-bromosuccinimide (NBS) in aqueous N,N-dimethylformamide at 75-80 °C, has been developed. Further, -CN and -CONH2 functionalized naphthalenes and anthracenes can also be transformed into respective para-quinones in a one pot reaction, after successive acid hydrolysis and subsequent reaction with NBS. We believe that the present finding may serve as a valuable alternative to the classical approaches for the synthesis of polycyclic quinones from polyaromatic carbaldehydes through Dakin oxidation followed by further oxidation of the resulting hydroquinone by heavy metal oxides.
- Natarajan, Palani,Vagicherla, Vinuta Devi,Vijayan, Muthana Thevar
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p. 3511 - 3515
(2014/06/10)
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- Side functionalization of diboronic acid precursors for covalent organic frameworks
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A series of substituted 1,4-benzenediboronic acids (BDBA) was synthesized and their thermal properties investigated. Two diboronic acids were studied as building-blocks for covalent organic framework (COF) formation, namely 2,5-dimethoxy-1,4-benzenediboronic acid and 2-nitro-1,4-benzeneboronic acid. Interestingly, substitution of the BDBA core caused a dramatic decrease of the polymerization temperature leading to the formation of a less organized structure.
- Faury, Thomas,Dumur, Frederic,Clair, Sylvain,Abel, Mathieu,Porte, Louis,Gigmes, Didier
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p. 2067 - 2075
(2013/04/23)
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- Aryl trihydroxyborate salts: Thermally unstable species with unusual gelation abilities
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A series of aryl trihydroxyborate salts were synthesized and found to form gels in benzene. The compounds were thermally unstable and readily underwent protodeboronation in solution and the solid state. Gelation could be induced without decomposition via sonication. Subsequent characterization studies revealed an unusual dependence of gel properties on alkyl chain length.
- Moy, Cheryl L.,Kaliappan, Raja,McNeil, Anne J.
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experimental part
p. 8501 - 8507
(2011/12/04)
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- BENZOFURAN-4,5-DIONES AS SELECTIVE PEPTIDE DEFORMYLASE INHIBITORS
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The instant invention provides novel benzofuran-4,5-diones and pharmaceutical compositions thereof useful for inhibiting PDF and for treating proliferative and infectious diseases. Compounds may be selective for eukaryotic (e.g., human) PDF or prokaryotic PDF
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Page/Page column 111; 113
(2010/11/18)
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- Synthesis and redox properties of a phosphine-subsituted para-dioxolene and its bimetallic palladium complex
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Oxidation of 2,5-bis(diphenylphosphino)-1,4-hydroquinone (8) with iodobenzene diacetate produces the corresponding bis(phosphine) substituted benzoquinone (9), the first phosphine-substitued quinone. Cyclic voltammetry studies reveal that the redox functi
- Caldwell, Sharon L.,Gilroy, Joe B.,Jain, Rajsapan,Crawford, Evan,Patrick, Brian O.,Hicks, Robin G.
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p. 976 - 981
(2008/12/23)
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- CONJUGATED ORGANIC MOLECULES FOR MOLECULAR ELECTRONIC DEVICES
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There is provided a conjugated molecule that is useful as a conductive path in an electronic device. The conjugated molecule includes at least one p/n junction so as to provide a direction to electron flow and one end alligator clip group which allows for self-orientation of the molecule during assembly in a device, resulting in an asymmetric structure of the molecule. The conjugated molecule may be used in diodes, molecular switches, transistors, and in the manufacture of memory devices.
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Page/Page column 26
(2010/11/23)
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- Quadraphasic phase-vanishing method: Application to bromination reactions that produce acidic by-products
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A quadraphasic phase-vanishing method was developed that employs water as the fourth phase acting as an 'acid scavanger phase'. This protocol worked well for bromination of acetophenones giving high yields of the corresponding α-bromo ketones. Georg Thieme Verlag Stuttgart.
- Rahman, Md. Taifur,Kamata, Naoya,Matsubara, Hiroshi,Ryu, Ilhyong
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p. 2664 - 2666
(2007/10/03)
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- Synthesis and photophysical studies of bis-enediynes as tunable fluorophores
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We have synthesized a family of bis-enediynes by two complementary Pd/Cu-catalyzed Sonogashira cross-coupling methods. One is a modified Sonogashira reaction between the TMS-protected tetraalkyne 20 (or 21) and various aromatic bromides to afford bis-enediynes 22a-d and 23a-d bearing different peripheral aryl units. The other, the reaction of bifunctional 1,1-dibromo-1-alkenes with phenylacetylene, afforded a series of bis-enediynes 24-32 bearing various core aryl groups. These chemical modifications to the core and periphery of bis-enediynes induce dramatic changes in absorption and emission spectra. Bis-enediynes 22 and 23 show a large Stokes shift of about 50-110 nm when compared to the less-conjugated bis-enediynes 20 and 21. Absorptions and emissions of bis-enediynes 25, 27-29, and 31 were red-shifted relative to those of enediyne 35. Substantial increases in fluorescence quantum yields are observed as a result of extending the π-conjugation. The emission wavelength of bis-enediynes was tailored from indigo blue to reddish-orange, suggesting that the color of emission can be tunable by modification of the core and/or peripheral units.
- Hwang, Gil Tae,Son, Hyung Su,Ku, Ja Kang,Kim, Byeang Hyean
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p. 11241 - 11248
(2007/10/03)
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- Efficient, multigram-scale synthesis of three 2,5-dihalobenzoquiones
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2,5-Dibromo-, 2,5-dichloro- and 2,5-diiodobenzoquinone were conveniently prepared from 1,4-dimethoxybenzene in 87%, 97% and 84% overall yields. None of the two steps of the synthesis required purification.
- Lopez-Alvarado, Pilar,Avendano, Carmen,Menendez, J. Carlos
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p. 3233 - 3239
(2007/10/03)
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- Blue-light-emitting cationic water-soluble polyfluorene derivatives with tunable quaternization degree
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The design, synthesis and characterization of novel blue emission cationic water-soluble conjugated polymers based on the polyfluorene (PF) derivatives with amino-terminal groups are described. Water solubility was realized through quaternization of the amino group, which permits a control of the cationic degree, which in turn determines the solubility of the polymers in organic solvents and water. Better solubility in polar solvents was accompanied by a spectral blue shift for polymers with a higher quaternization degree. In the presence of a trace amount of some weak organic acids, the neutral polymer also showed a high solubility in water. Instead of forming a quaternized salt, the 1H NMR spectra indicated that only electrostatic interaction existed between the acid and the amino-terminal groups, which increased the affinity of the polymers with those polar solvents. In addition to the special solubility, good thermal stability as well as the intense fluorescence both in solutions and as films endows this series of materials with the status of most attractive candidates as the transporting/emitting layer in multilayer device fabrication.
- Liu, Bin,Yu, Wang-Lin,Lai, Yee-Hing,Huang, Wei
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p. 4975 - 4982
(2007/10/03)
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- A simple and practical halogenation of activated arenes using potassium halide and oxone in water-acetonitrile medium
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A simple and practical halogenation of activated arenes using a reagent combination of potassium halide and oxone in water-acetonitrile medium is presented. The halogenated products were obtained with good yields and in high purity.
- Tamhankar,Desai,Mane,Wadgaonkar,Bedekar
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p. 2021 - 2027
(2007/10/03)
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- Accoutrements of a molecular computer: Switches, memory components and alligator clips
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Several second generation memory components consisting of oligo(phenylene ethynylene)s containing easily reducible functionalities consisting of either nitro or quinone cores have been synthesized for incorporation into molecular electronic devices. Addit
- Dirk, Shawn M.,Price Jr., David W.,Chanteau, Stephanie,Kosynkin, Dmitry V.,Tour, James M.
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p. 5109 - 5121
(2007/10/03)
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- Facile Oxidation of Fused 1,4-Dimethoxybenzenes to 1,4-Quinones Using NBS: Fine-Tuned Control over Bromination and Oxidation Reactions
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(Matrix Presented) Fused 1,4-dimethoxybenzenes could be oxidized to benzoquinones by either direct oxidation or demethylation-oxidation. The oxidative demethylation of 5,8-dimethoxy-2-methylquinoline using 1.1 equiv of NBS in aqueous THF and a catalytic amount of H2SO4 at 20°C for 5 min gave 2-methylquinoline-5,8-dione in 98% yield without bromination. Moreover, we can control either bromination or oxidative demethylation, or both reactions.
- Kim, Dong Wook,Choi, Han Young,Lee, Kee-Jung,Chi, Dae Yoon
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p. 445 - 447
(2007/10/03)
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- Simple and practical halogenation of arenes, alkenes and alkynes with hydrohalic acid/H2O2 or TBHP)
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A simple protocol for the halogenation of arenes utilizing a combination of aqueous hydrogen peroxide (34 %) or tert-butylhydroperoxide (70 %) and hydrohalic acid is presented. A similar procure of oxyhalogenation involving the in situ generation of positive halogen reagents is applied for the preparation of vicinal trans-dibromoalkanes and dichloroalkanes from alkenes. The reaction of alkenes with a combination of hydrochloric acid and hydrobromic acid with hydrogen peroxide gave a mixture of 1-bromo 2-chloro alkanes and 1,2-dibromoalkanes: Oxidative bromination of alkynes is also reported under similar conditions.
- Barhate, Nivrutti B.,Gajare, Anil S.,Wakharkar, Radhika D.,Bedekar, Ashutosh V.
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p. 11127 - 11142
(2007/10/03)
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- Simple and efficient chlorination and bromination of aromatic compounds with aqueous TBHP (or H2O2) and a hydrohalic acid
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A combination of aqueous tert-butylhydroperoxide (70%) or hydrogen peroxide (34%) and a hydrohalic acid was found effective in chlorination and bromination of aromatic compounds.
- Barhate, Nivrutti B.,Gajare, Anil S.,Wakharkar, Radhika D.,Bedekar, Ashutosh V.
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p. 6349 - 6350
(2007/10/03)
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- Selective bromination of aromatic ethers with pyridinium hydrobromide perbromide
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In aqueous polar solvents, various aromatic ethers were selectively brominated using pyridinium hydrobromide perbromide.
- Reeves, W. Preston,Lu, Cuong V.,Schulmeier, Brian,Jonas, Lynette,Hatlevik, Oyvind
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p. 499 - 505
(2007/10/03)
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- Using NBS as a mild bromination reagent for polyalkoxyaromatic systems
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N-Bromosuccinimide in Methylene Chloride is A Mild Mono- or Dibromination Reagent for Polyalkoxyaromatic Compounds Including Those Which are too Labile to be Brominated with Molecular Bromine.
- Bloomer, James L.,Zheng, Wei
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p. 2087 - 2095
(2007/10/03)
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- The preparations and some properties of mixed aryl-thienyl oligomers and polymers
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The syntheses by transition metal coupling reactions of a large number of oligomers constructed from benzene and thiophene rings are described. The first use of arylcadmium chlorides for such coupling reactions is reported. The routes chosen allow for rational variation in the modes of linkage, the substitution and the proportions of the two units. The benzene and thiophene rings are always joined in a known order and may bear a wide variety of regularly spaced functional groups. Additionally the shape of the oligomers may be varied at will. In all cases p-type doping with iodine or ferric chloride leads to large enhancements in conductivity.
- Pelter, Andrew,Jenkins, Ieuan,Jones, D. Elfyn
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p. 10357 - 10400
(2007/10/03)
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- Organocopper Chemistry of Quinone Bisketals. Application to the Synthaais of Isoprenoid Quinone Systems
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The reactions of organocuprates of 1,4-benzoquinone and 1,4-naphthoquinone bisketals are reported.These reagents, formed from the corresponding lithium reagent, cuprous iodide, and dimethyl sulfide react efficiently with allylic bromides (allyl, prenyl, geranyl, and phytyl), often with utilization of greater than one R group of the R2CuLi.Their reactions with acid chlorides and benzyl bromide proceed with acceptable efficiency, but they are unreactive toward a number of other substrates.The utility of this chemistry in the synthesis of menaquinone-2, phylloquinone,cymopol, and cymopol methyl ether is described.
- Chenard, Bertrand L.,Manning, Michael J.,Raynolds, Peter W.,Swenton, John S.
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p. 378 - 384
(2007/10/02)
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