- Hole-transporting spirothioxanthene derivatives as donor materials for efficient small-molecule-based organic photovoltaic devices
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A new class of hole-transporting spirothioxanthene derivatives has been synthesized and characterized. Their photophysical, electrochemical and thermal properties have been studied. These compounds exhibit high hole mobilities of up to 1 × 10-3 cm2 V-1 s-1, determined by using thin film transistor technique. In addition, these spirothioxanthene derivatives are promising donor materials in the construction of high performance organic photovoltaic (OPV) devices. With a very low dopant concentration of 7%, highly efficient small molecule-based OPV devices with high short-circuit current density of 10.83 mA cm-2, open-circuit voltage of 0.94 V, and high power conversion efficiency of 5.40% (the highest PCE of 5.46%) have been realized.
- Chan, Chin-Yiu,Wong, Yi-Chun,Chan, Mei-Yee,Cheung, Sin-Hang,So, Shu-Kong,Yam, Vivian Wing-Wah
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Read Online
- Environmentally Friendly and Recyclable CuCl 2-Mediated C-S Bond Coupling Strategy Using DMEDA as Ligand, Base, and Solvent
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Simple reaction conditions and recyclable reagents are crucial for environmentally friendly industrial applications. An environment-friendly, recyclable and economic strategy was developed to synthesize diaryl chalcogenides by the CuCl2-catalyzed C S bondformation reaction via iodobenzenes and benzenethiols/1,2-diphenyldisulfanes using N,N'-dimethylethane-1,2-diamine (DMEDA) as ligand, base, and solvent. For these reactions, especially the reactions of diiodobenzenes and aminobenzenethiols/disulfanediyldianilines, a range of substrates are compatible and give the corresponding products in good to excellent yields. Both of the reagents in the catalytic system (CuCl2/DMEDA) are inexpensive, conveniently separable, and recyclable for more than five cycles.
- Shen, Guodong,Lu, Qichao,Wang, Zeyou,Sun, Weiwei,Zhang, Yalin,Huang, Xianqiang,Sun, Manman,Wang, Zhiming
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supporting information
p. 184 - 198
(2021/09/20)
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- Transition metal complex, polymer, mixture, composition and organic electronic device
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The invention discloses a transition metal complex, a polymer, a mixture, a composition and an organic electronic device. When the transition metal complex provided by the invention is used as a light-emitting layer doping material and is applied to an organic electronic device, especially an OLED, the light-emitting efficiency of the device can be improved, and the service life of the device can be prolonged.
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Paragraph 0261-0264
(2021/06/26)
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- Room temperature nickel-catalyzed cross-coupling of aryl-boronic acids with thiophenols: Synthesis of diarylsulfides
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A NiCl2/2,2′-bipyridine-catalyzed cross-coupling of thiophenols with arylboronic acids has been developed for the synthesis of symmetric and unsymmetric diarylsulfides at room temperature and in air. This methodology is reliable and offers a mild and easy to operate process for the synthesis of arylthioethers, which are essential compounds with applications in the pharmaceutical and agricultural industries. This method avoids the use of expensive transition metals, such as Pd, Ir or Rh, sophisticated ligands and elevated temperatures. It also has a wide substrate scope (55 examples) and provides products in good to excellent yields (72-93%).
- Bhowmik, Amit,Fernandes, Rodney A.,Yadav, Mahesh
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p. 2447 - 2458
(2020/04/15)
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- Organic compound and application thereof, and organic electroluminescent device
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The invention relates to the field of organic electroluminescent devices, and discloses an organic compound and an application thereof, and an organic electroluminescent device; the compound has a structure represented by a formula (I) or a formula (II). According to the organic compound provided by the invention, the HOMO energy level and LUMO energy level of the organic electroluminescent material can be regulated and controlled, and meanwhile, the organic electroluminescent material containing the organic compound has relatively high hole mobility rate and electron mobility rate, so that the luminous efficiency is improved.
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Paragraph 0163-0165; 0173-0175
(2020/02/14)
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- Organic electroluminescent compound, applications thereof, and organic electroluminescent device
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The invention relates to the field of o organic electroluminescent devices and discloses an organic electroluminescent compound, applications thereof, and an organic electroluminescent device. The compound has the structure shown as the formula (I), where
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Paragraph 0073-0075
(2020/03/17)
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- CuMoO4 Bimetallic Nanoparticles, An Efficient Catalyst for Room Temperature C?S Cross-Coupling of Thiols and Haloarenes
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CuII catalyst is less efficient at room temperature for C?S cross-coupling. C?S cross-coupling by CuII catalyst at room temperature is not reported; however, doping of copper with molybdenum metal has been realized here to be more efficient for C?S cross-coupling in comparison to general CuII catalyst. The doped catalyst CuMoO4 nanoparticle is found to be more efficient than copper. The catalyst works under mild conditions without any ligand at room temperature and is recyclable and effective for a wide range of thiols and haloarenes (ArI, ArBr, ArF) from milligram to gram scale. The copper-based bimetallic catalyst is developed and recognized for C?S cross-coupling of haloarenes with alkyl and aryl thiols.
- Panigrahi, Reba,Sahu, Santosh Kumar,Behera, Pradyota Kumar,Panda, Subhalaxmi,Rout, Laxmidhar
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p. 620 - 624
(2019/12/27)
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- Novel blue thermal activity delayed fluorescence material and application thereof
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In order to further reduce delta EST and obtain a more efficient TADF material, the invention discloses a novel blue thermal activity delayed fluorescence material and application thereof, and the blue thermal activity delayed fluorescence material is a novel blue light TADF material with dimethyl acridine as a donor, diphenyl sulfone as an acceptor, a benzene ring or pyridine as pi bridge, wherein the dimethyl acridine is a strong electron donating unit, the diphenyl sulfone is a weak acceptor unit, and the combination of the dimethyl acridine and the diphenyl sulfone is beneficial to reducing intramolecular charge transfer effect and realizing blue light emission; the benzene ring or the pyridine pi bridge can increase distortion of molecules, HOMO and LUMO orbital separation can be achieved, the delta EST is reduced, and TADF performance is obtained; meanwhile, the conjugation degree of the molecules can be regulated and controlled at different positions of the dimethyl acridine donor and the diphenyl sulfone acceptor, so that the light-emitting wavelength of the material is regulated, and the TADF material with the emission wavelength within 420-450 nm is realized.
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Paragraph 0031-0035
(2020/09/16)
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- Bimetallic BaMoO4 nanoparticles for the C-S cross-coupling of thiols with haloarenes
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We disclosed new bimetallic BaMoO4 nanoparticles for the C-S cross-coupling reaction. The C-S cross-coupling reaction of alkyl/aryl thiols with haloarenes was accomplished with high yields. The reaction has good functional group tolerance and selectivity. This is an efficient protocol for synthesizing the building blocks of pharmaceuticals containing C-S bonds. The catalyst is recyclable. The unactivated bromo- and 4-acetyl fluoro-arenes can well couple to afford thioethers in high yields. The reaction is believed to proceed by oxidative addition and reductive elimination.
- Panda, Subhalaxmi,Sahu, Santosh Kumar,Behera, Pradyota Kumar,Panigrahi, Reba,Garnaik, Bamakanta,Rout, Laxmidhar
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supporting information
p. 2500 - 2504
(2020/02/20)
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- DELAYED FLUORESCENT COMPOUND, AND ORGANIC LIGHT EMITTING DIODE AND ORGANIC LIGHT EMITTING DISPLAY DEVICE INCLUDING THE SAME
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The disclosure provides a delayed fluorescent compound of the Formula and an organic light emitting diode including a first electrode, a second electrode and an organic emitting layer between the first and second electrodes, where the delayed fluorescent
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Paragraph 0096-0098
(2020/07/16)
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- Nitrogen-containing organic compound, application thereof and organic light-emitting device
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The invention relates to the field of organic light-emitting devices, and discloses a nitrogen-containing organic compound, application thereof and an organic light-emitting device. The nitrogen-containing organic compound has a structure as shown in a fo
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Paragraph 0179; 0180; 0181
(2020/08/30)
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- Ag-Catalyzed Cyclization of Arylboronic Acids with Elemental Selenium for the Synthesis of Selenaheterocycles
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A general method for the synthesis of five-membered and six-membered selenaheterocycles through Ag-catalyzed C?Se bond-forming reaction is reported. This reaction proceeds via intramolecular cyclization of arylboronic acids with selenium powder. Preliminary mechanism studies demonstrate that this transformation involves a selenium-centred radical intermediate. (Figure presented.).
- Gao, Wen-Xia,Huang, Xiao-Bo,Liu, Miao-Chang,Wu, Hua-Yue,Zhang, Xue,Zhou, Yun-Bing
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supporting information
p. 5639 - 5644
(2020/11/30)
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- Syntheses of Thioethers and Selenide Ethers from Anilines
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In this study, a general procedure was proposed for synthesizing thioethers and selenide ethers from anilines under solvent-free and transition-metal-free conditions. Thioethers were formed when anilines reacted with thiols under blue light-emitting-diode (LED) irradiation at room temperature without a photocatalyst. When reactions were performed using anilines and diselenides, the corresponding selenide ethers were obtained with satisfactory to excellent yields. The reaction was performed under photocatalyst-free and solvent-free conditions without blue LEDs. The advantages of this system include convenient operations, mild reaction conditions, satisfactory functional group tolerance, and late-stage selenylation of drug molecules.
- Shieh, Yi-Chen,Du, Kai,Basha, R. Sidick,Xue, Yung-Jing,Shih, Bo-Hao,Li, Liang,Lee, Chin-Fa
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p. 6223 - 6231
(2019/05/24)
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- COMPOUND AND ORGANIC ELECTRONIC DEVICE USING THE SAME
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Provided are a novel compound and an organic electronic device using the same. The novel compound is represented by the following Formula (I): wherein Y is an oxygen atom or a sulfur atom; X1 and X2 are each independently C(Ra), the two (Ra)s are the same or different, and the two (Ra)s are joined together to form a first aryl ring; X3 and X4 are each independently C(Rb), the two (Rb)s are the same or different, and the two (Rb)s are joined to form a second aryl ring or a heteroaryl ring.
- -
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Paragraph 0085; 0086
(2019/04/14)
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- New arylselanylpyrazole-copper catalysts: Highly efficient catalytic system for C–Se and C–S coupling reactions
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We describe herein the use of arylselanylpyrazole–copper complexes as versatile catalysts for C–Se and C–S coupling reactions. The performance of these complexes for C–Se reactions was investigated in chalcogenoacetylene synthesis. The reactions were carried out under mild and aerobic conditions and afforded selanylalkynes bearing a variety of electron-withdrawing and electron-donating groups. The performance of these catalysts for C–S coupling was investigated through the reaction of aryl halides with thiols and products were obtained in moderate to excellent yields. A plausible mechanism for selenoacetylene synthesis is also suggested, and the 77Se NMR results show that these arylselanylpyrazole ligands act as hemilabile ligands. High-resolution mass spectrometry was used to investigate the intermediates and also to corroborate the proposed catalytic cycle.
- Coelho, Felipe Lange,Dresch, Lucielle Codeim,Stieler, Rafael,Campo, Leandra Franciscato,Schneider, Paulo Henrique
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- Surfactant-Type Catalyst for Aerobic Oxidative Coupling of Hydrazine with Thiol in Water
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A series of PEG-functionalized nitrogen ligands were developed to conduct an aerobic oxidative cross-coupling reaction between alkyl- or aryl-hydrazines with thiols in water. This surfactant-type catalyst enables high efficiencies and selectivities, while tolerating a large variety of functional groups. The mother liquor is still catalytically active after five runs.
- Ren, Xuanhe,Tang, Shanyu,Li, Longjia,Li, Jiao,Liang, Helong,Li, Ganzhong,Yang, Guanyu,Li, Heng,Yuan, Bingxin
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p. 8683 - 8690
(2019/07/08)
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- COMPOUND AND ORGANIC ELECTRONIC DEVICE USING THE SAME
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Provided are a novel compound and an organic electronic device using the same. The novel corn pound is represented by the following Formula (I): wherein Y is an oxygen atom, a sulfur atom, or a sulfur dioxide group; X1 and X2 are each independently C(Ra), multiple (Ra)s are the same or different, and the two (Ra)s are joined together to form a first aryl ring; X3 and X4 are each independently C(Rb), multiple (Rb)s are the same or different, and the two (Rb)s are joined to form a second aryl ring or a heteroaryl ring.
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Paragraph 0098; 0099
(2018/06/15)
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- COMPOUND AND ORGANIC ELECTRONIC DEVICE USING THE SAME
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Provided are a novel compound and an organic electronic device using the same. The novel compound is represented by the following Formula (I): wherein Y is an oxygen atom or a sulfur atom; X 1and X 2are each independently C(R a), the two(R a)s are the same or different, and the two (R a)s are joined together to form a first aryl ring; X 3and X 4are each independently C(R b), the two (R b)s are the same or different, and the two (R b)s are joined to form a second aryl ring or a heteroaryl ring.
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Paragraph 0070; 0071
(2019/04/30)
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- Ring-Closing Synthesis of Dibenzothiophene Sulfonium Salts and Their Use as Leaving Groups for Aromatic 18F-Fluorination
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Herein, we report a novel intramolecular ring-closing reaction of biaryl thioethers that give access to highly functionalized dibenzothiophene sulfonium salts under mild conditions. The resulting precursors react regioselectively with [18F]fluo
- Gendron, Thibault,Sander, Kerstin,Cybulska, Klaudia,Benhamou, Laure,Sin, Pak Kwan Brian,Khan, Aqsa,Wood, Michael,Porter, Michael J.,?rstad, Erik
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supporting information
p. 11125 - 11132
(2018/09/11)
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- Based on screw type sulfur mixed anthracene organic small molecule material and taking the material as the luminescent layer of the organic photoelectric device
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The invention belongs to the technical field of photoelectric materials and particularly relates to an organic small molecular material based on spiro thioxanthene and an organic photoelectric device using the material as a light emitting layer. By using
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Paragraph 0032; 0033; 0034; 0035
(2017/08/24)
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- Transition-metal-free synthesis of thiocyanato- or nitro-arenes through diaryliodonium salts
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A transition-metal-free approach to facile synthesis of thiocyanato- and nitro-arenes was developed from KSCN (potassiumthiocyanate) or NaNO2with diaryliodonium salts in good yields under mild conditions. The reaction was compatible with a variety of sensitive functional substituents such as halides and nitro and ester groups. The usefulness of arylation products has been realized. (Formula Present).
- Li, Xiao-Hua,Li, Liang-Gui,Mo, Xue-Ling,Mo, Dong-Liang
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supporting information
p. 963 - 970
(2016/07/07)
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- Copper nanopowder catalyzed cross-coupling of diaryl disulfides with aryl iodides in PEG-400
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An eco-friendly thiolation via diaryl disulfides and aryl iodides under ligand-free conditions is reported. With copper nanopowder as catalyst and PEG-400 as solvent, a variety of unsymmetrical diaryl sulfides are synthesized in good to excellent yields. The process is free from foul-smelling and unstable thiols and the copper nanopowder-PEG-400 catalytic system can be directly reused for four repetitive cycles.
- Wu, Xiang-Mei,Yan, Guo-Bing
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supporting information
p. 537 - 542
(2015/04/27)
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- Light-induced rearrangement of thioether-substituted phosphanide ligands: Scope and limitations of a remarkable isomerization
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Treatment of the thioether-substituted secondary phosphanes R 2PH(C6H4-2-SR1) [R 2=(Me3Si)2CH, R1=Me (1 PH), iPr (2PH), Ph (3PH); R2=tBu, R1=Me (4PH); R2=Ph, R1=Me (5 PH)] with nBuLi yields the corresponding lithium phosphanides, which were isolated as their THF (1-5Pa) and tmeda (1-5Pb) adducts. Solid-state structures were obtained for the adducts [R 2P(C6H4-2-SR1)]Li(L)n [R2=(Me3Si)2CH, R1=nPr, (L) n=tmeda (2Pb); R2=(Me3Si) 2CH, R1=Ph, (L)n=tmeda (3Pb); R 2=Ph, R1=Me, (L)n=(THF)1.33 (5 Pa); R2=Ph, R1=Me, (L)n=([12]crown- 4)2 (5Pc)]. Treatment of 1PH with either PhCH2Na or PhCH2K yields the heavier alkali metal complexes [{(Me3Si)2CH}P(C6H 4-2-SMe)]M(THF)n [M=Na (1Pd), K (1 Pe)]. With the exception of 2Pa and 2Pb, photolysis of these complexes with white light proceeds rapidly to give the thiolate species [R2P(R1)(C6H 4-2-S)]M(L)n [M=Li, L=THF (1Sa, 3 Sa-5Sa); M=Li, L=tmeda (1Sb, 3 Sb-5Sb); M=Na, L=THF (1Sd); M=K, L=THF (1 Se)] as the sole products. The compounds 3Sa and 4 Sa may be desolvated to give the cyclic oligomers [[{(Me 3Si)2CH}P(Ph)(C6H4-2-S)]Li] 6 ((3S)6) and [[tBuP(Me)(C6H 4-2-S)]Li]8 ((4S)8), respectively. A mechanistic study reveals that the phosphanide-thiolate rearrangement proceeds by intramolecular nucleophilic attack of the phosphanide center at the carbon atom of the substituent at sulfur. For 2Pa/2Pb, competing intramolecular β-deprotonation of the n-propyl substituent results in the elimination of propene and the formation of the phosphanide-thiolate dianion [{(Me3Si)2CH}P(C6H4-2-S)] 2-. Copyright
- Izod, Keith,Clark, Ewan R.,Foster, Pamela,Percival, Rebecca J.,Riddlestone, Ian M.,Clegg, William,Harrington, Ross W.
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supporting information
p. 6094 - 6107
(2013/06/05)
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- Chan-lam-type s-arylation of thiols with boronic acids at room temperature
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In this work, an efficient CuSO4-catalyzed S-arylation of thiols with aryl and heteroaryl boronic acids at room temperature is established. This catalytic system can tolerate a wide variety of thiols and arylboronic acids in the presence of only 5 mol % of CuSO4 as the catalyst and inexpensive 1,10-phen?H2O as the ligand. Moreover, this catalytic system used environment-friendly solvent (EtOH) and oxidant (oxygen).
- Xu, Hua-Jian,Zhao, Yong-Qiang,Feng, Teng,Feng, Yi-Si
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experimental part
p. 2878 - 2884
(2012/05/04)
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- Tert-Butanesulfinylthioether ligands: Synthesis and application in palladium-catalyzed asymmetric allylic alkylation
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A class of novel chiral SO-S-type bidentate ligands based on the tert-butylsulfinyl moiety as the sole chiral source were designed and synthesized through a simple and efficient pathway. These ligands are effective catalyst precursors for the palladium-catalyzed allylic alkylation of 1,3-diphenyl-2-propenyl acetate and moderate to good stereoselectivities (up to 84% ee) were obtained.
- Liu, Jibing,Chen, Guihua,Xing, Junwei,Liao, Jian
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experimental part
p. 575 - 579
(2011/06/21)
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- Ruthenium olefin metathesis catalysts containing six-membered sulfone and sulfonamide chelating rings
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The preparation and X-ray structure characterization of new olefin metathesis initiators containing sulfone- and sulfonamide-substituted benzylidene ligands are described. We observed that these catalysts exhibit Ru???O(SO)R interactions, forming six-memb
- Szadkowska, Anna,Zukowska, Karolina,Pazio, Aleksandra E.,Wozniak, Krzysztof,Kadyrov, Renat,Grela, Karol
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scheme or table
p. 1130 - 1138
(2011/04/26)
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- A study of factors affecting enantioselectivity in the oxidation of aryl benzyl sulfides in the presence of chiral titanium catalysts
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A series of experiments was performed to test a theoretical model that we have recently proposed to explain the highly enantioselective oxidation of aryl benzyl sulfides with tert-butyl hydroperoxide in the presence of a complex between titanium and (S,S)
- Capozzi, Maria Annunziata M.,Centrone, Caterina,Fracchiolla, Giuseppe,Naso, Francesco,Cardellicchio, Cosimo
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supporting information; experimental part
p. 4327 - 4334
(2011/09/16)
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- A highly efficient, ligand-free, and recyclable Cu2S-catalyzed coupling of aryl iodides with diaryl disulfides
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A highly efficient and ligand-free copper(I) sulfide catalyzed cross-coupling reaction of aryl iodides with diaryl disulfides was developed. With only 1 mol-% of Cu2S as the catalyst, iron powder as the reductant, and K2CO3 as the base, aryl iodides reacted with disulfides in DMSO at 90-110 °C for 18-24 h under an atmosphere of argon to give the corresponding aryl sulfides in good to excellent yields. In addition, the catalyst is recyclable and reusable with some loss of activity.
- Wang, Huifeng,Jiang, Linlin,Chen, Tao,Li, Yarning
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experimental part
p. 2324 - 2329
(2010/07/10)
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- A highly efficient and widely functional-group-tolerant catalyst system for copper(I)-catalyzed S-arylation of thiols with aryl halides
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A mild, general, and efficient copper-catalyzed system for C-S bond formation with high chemoselectivity and wide functional group tolerance is developed. With CuBr as catalyst and 1,2,3,4-tetrahydro-8-hydroxy-quinoline as ligand, the S-arylation of thiols with aryl halides performed well, the activated aryl iodides could take place even at room temperature, and the activated aryl bromides and chlorides give the corresponding products with good to excellent yields as well.
- Feng, Yang,Wang, Huifeng,Sun, Fangfang,Li, Yaming,Fu, Xinmei,Jin, Kun
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supporting information; experimental part
p. 9737 - 9741
(2010/02/27)
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- Synthesis of molecular chains: phenylene thioether and sulfoxide oligomers
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The application of a general synthetic approach to prepare molecular chains is reported. It is based on a step-by-step method each consisting first in a Pd-catalyzed reaction between ArI and HXAr′Br (Ar=aryl, Ar′=arylene) to give ArXAr′Br followed by a Cu
- Vicente, José,Abad, José A.,López-Nicolás, Rosa M.
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p. 6281 - 6288
(2008/09/21)
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- Efficient copper(I)-catalyzed C-S cross coupling of thiols with aryl halides in water
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CuI efficiently catalyzes the C-S cross coupling of thiols with aryl halides in the presence of tetrabutylammonium bromide in water. The reactions with aryl thiols that have electron-withdrawing and -donating substituents are comparable and afford C-S cross-coupling products in high yield. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
- Rout, Laxmidhar,Saha, Prasenjit,Jammi, Suribabu,Punniyamurthy, Tharmalingam
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p. 640 - 643
(2008/09/17)
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- Palladium-catalyzed three-component approach to promazine with formation of one carbon-sulfur and two carbon-nitrogen bonds
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(Chemical Presented) Zip it up! The use of a Pd/dppf catalyst gives access to the tricyclic phenothiazine scaffold starting from 1-bromo-2-iodobenzenes, aliphatic or aromatic amines, and 2-bromothiophenols in a single reaction flask (see scheme; dppf=1,1′-bis(diphenylphosphanyl) ferrocene; dba=dibenzylidineacetone). This transformation involves thioether formation and subsequent intermolecular and intramolecular aryl amination reactions. The reaction occurs in good overall yield and selectivity.
- Dahl, Troels,Tornoe, Christian W.,Bang-Andersen, Benny,Nielsen, Poul,Jorgensen, Morten
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supporting information; experimental part
p. 1726 - 1728
(2009/02/06)
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- Efficient CuO-nanoparticle-catalyzed C-S cross-coupling of thiols with iodobenzene
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Cheap but good: Readily available CuO nanoparticles are not only less expensive than other catalysts used for the C-S cross-coupling of thiols with aryl halides, but they are also effective at a moderate temperature and low concentration. The title reaction proceeds with a variety of alkyl and aryl thiols to give the corresponding sulfides in high yields (see scheme).
- Rout, Laxmidhar,Sen, Tamal K.,Punniyamurthy, Tharmalingam
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p. 5583 - 5586
(2008/03/18)
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- L-proline-promoted CuI-catalyzed C-S bond formation between aryl iodides and thiols
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An improved, mild procedure for the CuI-catalyzed coupling reactions of aryl iodides with aliphatic and aromatic thiols, using L-proline as the ligand, is reported. This procedure is noteworthy given its high generality and exceptional level of functional group toleration. Copyright Taylor & Francis Group, LLC.
- Zhang, Hui,Cao, Weiguo,Ma, Dawei
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- Alkyl- and Arylthiodediazoniations of Dry Arenediazonium o-Benzenedisulfonimides. Efficient and Safe Modifications of the Stadler and Ziegler Reactions to Prepare Alkyl Aryl and Diaryl Sulfides
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The reaction between dry arenediazonium o-benzenedisulfonimides 1 and sodium thiolates in anhydrous methanol represents an efficient and safe procedure, of general validity, for the preparation of unfunctionalized or variously functionalized alkyl aryl and diaryl sulfides. As a rule, the reaction temperature was maintained at 0-5°C for the alkylthiodediazoniations and at room temperature (20-25°C) for the arylthiodediazoniations. The sulfide yields are generally high; of the 63 considered examples, 43 gave yields greater than 80% and 13 were between 70% and 80%. Lower yields were obtained only when sterically hindered diazonium salts or thiols were used. A good amount of the o-benzenedisulfonimide (8) was always recovered from the reactions and could be reused to prepare salts 1. The copious experimental data collected in homogeneous conditions have offered several starting points for the study of the mechanism of these reactions.
- Barbero, Margherita,Degani, Iacopo,Diulgheroff, Nicola,Dughera, Stefano,Fochi, Rita,Migliaccio, Mara
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p. 5600 - 5608
(2007/10/03)
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- Scope of Tandem Cycloaddition/Radical Cyclization Methodology
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Tandem cycloaddition/radical cyclization is an effective strategy for the rapid assembly of a wide variety of ring systems.To set up the reagents for this sequence, it is necessary to include a potential radical site in one of the two cycloaddition partners, located at an appropriate distance from a new double bond that will be formed in the cycloaddition step.Examples in which the cycloaddition step is or and in which the radical cyclization creates 5-, 6-, or 7-membered rings are described.Examples of the tandem methodology carried out in a completely intramolecular mode are also described.
- Ghosh, Tirthankar,Hart, Harold
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p. 5073 - 5085
(2007/10/02)
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- Synthesis and Reactivity of a Cyclopropyloxy Sulfurane
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We have synthesized cyclopropyloxy sulfurane 1 and report its reactivity relative to gem-dimethyl sulfurane 2; the change in reactivity brought about by a minor alteration of the geometry of the five-membered ring is large.
- Datta, Arun K.,Livant, Peter D.
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p. 2445 - 2447
(2007/10/02)
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