- Optimizing Fe-Based Metal-Organic Frameworks through Ligand Conformation Regulation for Efficient Dye Adsorption and C2H2/CO2 Separation
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Regulating the structure of metal-organic frameworks (MOFs) by adjusting the ligands reasonably is expected to enhance the interaction of MOFs on special molecules/ions, which has significant application value for the selective adsorption of guest molecul
- Zhang, Xiurong,Fan, Weidong,Jiang, Weifeng,Li, Yue,Wang, Yutong,Fu, Mingyue,Sun, Daofeng
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Read Online
- Dense Alkyne Arrays of a Zr(IV) Metal-Organic Framework Absorb Co(CO) for Functionalization
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Finely dispersed Co(0) and CoO species were efficiently loaded into a stable metal-organic framework to impart catalytic activities to the porous solid. The metalation of the MOF host is facilitated by the dense arrays of accessible alkyne units that boost the alkyne-Co(CO) interaction. The tetrakis(4-carboxylphenylethynyl)pyrene linker, with eight symmetrically backfolded alkyne side arms, features strong fluorescence and a dendritic Sierpinski shape. The resultant Zr(IV)-MOF features NU-901 topology (scu net, with rhombus channels) and breathing properties (e.g., the contracted (porous) phase reverts to the as-made phase upon contact with DMF (dimethylformamide)). The inserted Co(CO) guests quickly react with air to form atomically dispersed CoO species (nondiffracting), and subsequent thermal treatment at 600 °C of the CoO-loaded solid generates an electrocatalyst for the oxygen evolution reaction (OER).
- Cheng, Shengxian,Diao, Yingxue,He, Jun,Hu, Jieying,Hu, Xiangzi,Li, Mu-Qing,Li, Yang Yang,Ma, Feixiang,Xu, Zhengtao
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supporting information
(2020/04/10)
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- A Porous and Solution-Processable Molecular Crystal Stable at 200 °c: The Surprising Donor-Acceptor Impact
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We report a curious porous molecular crystal that is devoid of the common traits of related systems. Namely, the molecule does not rely on directional hydrogen bonds to enforce open packing, and it offers neither large concave faces (i.e., high internal f
- Cheng, Shengxian,Ma, Xiaoxia,He, Yonghe,He, Jun,Zeller, Matthias,Xu, Zhengtao
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p. 7411 - 7419
(2019/12/02)
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- Dramatic improvement of stability by: In situ linker cyclization of a metal-organic framework
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We employ a two-step strategy for accessing crystalline porous covalent networks of highly conjugated π-electron systems. For this, we first assembled a crystalline metal-organic framework (MOF) precursor based on Zr(iv) ions and a linear dicarboxyl linker molecule featuring backfolded, highly unsaturated alkyne backbones; massive thermocyclization of the organic linkers was then triggered to install highly conjugated, fused-aromatic bridges throughout the MOF scaffold while preserving the crystalline order. The formation of cyclized carbon links not only greatly strengthens the precursor coordination scaffold, but also, more importantly, enhances electroactivity and charge transport throughout the polycyclic aromatic grid.
- Hou, Yun-Long,Li, Mu-Qing,Cheng, Shengxian,Diao, Yingxue,Vilela, Filipe,He, Yonghe,He, Jun,Xu, Zhengtao
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supporting information
p. 9470 - 9473
(2018/08/28)
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- PESTICIDAL COMPOSITIONS AND PROCESSES RELATED THERETO
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This disclosure relates to the field of molecules having pesticidal utility against pests in Phyla Nematoda, Arthropoda, and/or Mollusca, processes to produce such molecules and intermediates used in such processes, compositions containing such molecules, and processes of using such molecules against such pests. These molecules may be used, for example, as nematicides, acaricides, insecticides, miticides, and/or molluscicides. This document discloses molecules having the following formula (“Formula One”).
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Paragraph 0444
(2015/12/30)
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- Fast and efficient bromination of aromatic compounds with ammonium bromide and Oxone
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A highly efficient, rapid and regioselective protocol was developed for the ring bromination of aromatic compounds under mild conditions with ammonium bromide as a source of bromine source and Oxone (potassium peroxysulfate) as an oxidant. No metal catalyst or acidic additive is required. A variety of aromatic compounds, including methoxy, hydroxy, amino, and alkyl arenes, reacted smoothly to give the corresponding monobrominated products in good to excellent yields in very short reaction times. Moreover, dibromination of deactivated anilines to give the corresponding dibromides proceeded in high yields. Interestingly, 1-(2-naphthyl)ethanone provided a ring-brominated product. Georg Thieme Verlag Stuttgart . New York.
- Naresh, Mameda,Arun Kumar, Macharla,Mahender Reddy, Marri,Swamy, Peraka,Nanubolu, Jagadeesh Babu,Narender, Nama
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p. 1497 - 1504
(2013/06/27)
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- Total synthesis of vancomycin - Part 1: Design and development of methodology
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o-Halosubstituted aromatic triazenes (e.g. I, Scheme 1) react with aryloxides (e.g. II, Scheme 1) in the presence of CuBr · Me2S, K2CO3 and pyridine in acetonitrile at reflux to afford biaryl ethers (e.g. V, Scheme 1). This general methodology (Tables 1 and 2) was applied to the construction of the C-O-D and D-O-E vancomycin model systems 37 (Scheme 2) and 50 (Scheme 3), demonstrating its potential in a projected total synthesis of vancomycin (1. Figure 1). For the construction of the vancomycin model AB biaryl ring system, a sequential strategy involving a Suzuki coupling of the C-O-D aryl iodide 74 (Scheme 7) and boronic acid 53 (Scheme 4), followed by macrolactamization was demonstrated, in which the preformed C-O-D ring framework served to preorganize the precursor for cyclization. The latter investigation led to Suzuki-coupling-based asymmetric synthesis of biaryl systems in which 2,2-bis(diphenylphosphino)-1,1'-binaphthyl (BINAP) was found to be the optimum ligand (Tables 3 and 4).
- Nicolaou,Li, Hui,Boddy, Christopher N. C.,Ramanjulu, Joshi M.,Yue, Tai-Yuen,Natarajan, Swaminathan,Chu, Xin-Jie,Braese, Stefan,Ruebsam, Frank
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p. 2584 - 2601
(2007/10/03)
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- Total synthesis of vancomycin - Part 2: Retrosynthetic analysis, synthesis of amino acid building blocks and strategy evaluations
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Retrosynthetic analysis of vancomycin (1) defined vancomycin's aglycon (2) and protected triazene 3 (Figure 1) as advanced intermediates for an eventual total synthesis. Sequential assembly of 3 as shown in Figure 2 (strategy I) and Figure 3 (strategy II) led to amino acid building blocks 8-10 and 12-15, respectively, representing vancomycin's amino acids AA-1 to AA-7. These amino acid fragments were constructed by stereoselective routes and the two synthetic strategies were tested for feasibility. Strategy I, postulating construction of the vancomycin main framework in the order of D-O-E→D-O-E/C-O-D→D-O-E/C-O-D/A-B, suffered from serious epimerization problems at the AA-4 stereocenter; while strategy II, involving the sequence C-O-D→C-O-D/AB→C-O-D/AB/D-O-E proved viable. These findings set the stage for the final drive towards vancomycin's aglycon (2) and vancomycin (1).
- Nicolaou,Boddy, Christopher N. C.,Li, Hui,Koumbis, Alexandros E.,Hughes, Robert,Natarajan, Swaminathan,Jain, Nareshkumar F.,Ramanjulu, Joshi M.,Braese, Stefan,Solomon, Michael E.
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p. 2602 - 2621
(2007/10/03)
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- A PRACTICAL SYNTHESIS OF ISOTOPICALLY LABELLED 1-(4-ISOTHIOCYANATOPHENYL)-4-(t-BUTYL)-2,6,7-TRIOXABICYCLOOCTANE, A PROBE FOR THE BENZODIAZEPINE RECEPTOR-COUPLED CHLORIDE IONOPHORE
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An efficient synthesis of high specific activity 1-(4-isothiocyanato-3,5-ditritiophenyl)-4-(t-butyl)-2,6,7-trioxabicyclooctane (-1), an affinity ligand for the benzodiazepine (BZ)-coupled γ-aminobutyric acid (GABA)-gated chloride channel, w
- Costa, Brian R. de,Lewin, Anita,Schoenheimer, Joyce A.,Skolnick, Phil,Rice, Kenner C.
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p. 2343 - 2355
(2007/10/02)
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- Syntheses and Physical Properties of Several Octiphenyls and a Septiphenyl
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Six symmetrical linear octiphenyls were synthesized by the Ullmann homo-coupling reaction of iodoquaterphenyl.Another satisfactory method for synthesizing octiphenyls is also described, i.e., a Kharash-type Grignard cross-coupling of biphenylylmagnesium bromide and diiodoquaterphenyl in the presence of bis(acetylacetonato)nickel(II).Moreover, m-septiphenyl was succesfully synthesized by deamination of the corresponding amino compound.Infrared studies of the polyphenyls indicated that the fine-structure bands in the regions of 770-810 and 870-915 cm-1 may be considered as indicators of the presence of consecutive m-phenylene rings, regardless of the existence of o- or p-phenylene rings.The ultraviolet spectra of the octiphenyls, which contain two kinds of linkages, showed absorption curves closely related to those of quaterphenyls corresponding to the structural units of the former compounds.The nuclear magnetic resonance spectra of the polyphenyls without an o-phenylene ring showed multiplet peaks due to the resonances of an isolated m-phenylene proton at the lowest field within a narrow region (δ 7.81-7.95).Hueckel molecular orbital calculations of the longest wavelength absorption bands of ten polyphenyls were carried out.The calculated and observed wavelengths were in rather good agreement except for the cases of three compounds.Keywords - Ullmann reaction; Ni-complex-catalyzed cross-coupling; octiphenyls; septiphenyls; IR; UV; NMR; MO; quaterphenyl derivatives; polyphenyls
- Ozasa, Shigeru,Fujioka, Yasuhiro,Fujiwara, Michiko,Ibuki, Eiichi
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p. 3210 - 3222
(2007/10/02)
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