- Reductive sulfur extrusion reaction of 2,1,3-benzothiadiazole compounds: A new methodology using NaBH4/CoCl2·6H 2O(cat) as the reducing system
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A new simple and efficient methodology for reductive sulfur extrusion from 2,1,3-benzothiadiazole compounds has been developed using NaBH4 in the presence of catalytic amounts of CoCl2·6H2O (1 mol %). This method is an efficient alternative for the generation of various 1,4-disubstituted-2,3-diaminobenzene derivatives from 4,7-disubstituted-2,1,3- benzothiadiazoles. The diamines can be easily converted into 4,7-disubstituted-quinoxaline compounds by simple reaction with glyoxal-sodium bisulfite.
- DaSilveira Neto, Brenno A.,Lopes, Aline S.,Wüst, Martina,Costa, Valentim E. U.,Ebeling, Günter,Dupont, Jairton
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- Building a Pyrazole–Benzothiadiazole–Pyrazole Photosensitizer into Metal–Organic Frameworks for Photocatalytic Aerobic Oxidation
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Charge separation plays a crucial role in regulating photochemical properties and therefore warrants consideration in designing photocatalysts. Metal–organic frameworks (MOFs) are emerging as promising candidates for heterogeneous photocatalysis due to their structural designability and tunability of photon absorption. Herein, we report the design of a pyrazole–benzothiadiazole–pyrazole organic molecule bearing a donor–acceptor–donor conjugated π-system for fast charge separation. Further attempts to integrate such a photosensitizer into MOFs afford a more effective heterogeneous photocatalyst (JNU-204). Under visible-light irradiation, three aerobic oxidation reactions involving different oxygenation pathways were achieved on JNU-204. Recycling experiments were conducted to demonstrate the stability and reusability of JNU-204 as a robust heterogeneous photocatalyst. Furthermore, we illustrate its applications in the facile synthesis of pyrrolo[2,1-a]isoquinoline-containing heterocycles, core skeletons of a family of marine natural products. JNU-204 is an exemplary MOF platform with good photon absorption, suitable band gap, fast charge separation, and extraordinary chemical stability for proceeding with aerobic oxidation reactions under visible-light irradiation.
- Jin, Ji-Kang,Wu, Kun,Liu, Xin-Yi,Huang, Guo-Quan,Huang, Yong-Liang,Luo, Dong,Xie, Mo,Zhao, Yifang,Lu, Weigang,Zhou, Xiao-Ping,He, Jian,Li, Dan
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supporting information
p. 21340 - 21349
(2021/12/17)
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- Two-dimensional metal organic complex containing thiazole functional groups, and preparation method and application thereof
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The invention discloses a two-dimensional metal organic complex containing thiazole functional groups, and a preparation method and application thereof. According to a technical scheme in the invention, the preparation method comprises the following steps: adding Pb(NO), 4,4'-(benzothiazolyl-4,7-disubstituted)-dibenzoic acid and a solvent, namely N,N-dimethylformamide into a container, and carrying out stirring for 30 minutes at normal temperature until the materials are uniformly mixed; sealing the container, putting the container into an oven, and keeping the container at a temperatureof 368 K for 1 day; carrying out slow cooling to room temperature to obtain a yellow transparent rod-like crystal; and washing the yellow transparent rod-like crystal with N,N-dimethylformamide, andcarrying out filtering and drying to obtain a target product (Pb-btdb). The prepared two-dimensional metal organic complex containing the thiazole functional groups is used as a catalyst and can efficiently catalyze cycloaddition conversion of carbon dioxide and epoxide to prepare cyclic carbonate.
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- Fluorescent metal-organic frameworks for selective sensing of toxic cations (Tl3+, Hg2+) and highly oxidizing anions ((CrO4)2?, (Cr2O7)2?, (MnO4)?)
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The ligand 4,4′‐(benzothiadiazole‐4,7‐diyl)dibenzoic acid was synthesized and employed for the synthesis of two metal-organic framework (MOF) compounds, [Mn4(C20H10N2O4S)2(HCOO)4(DEF)2] (I; DEF=N, N′‐diethylformamide) and [Pb(C20H10N2O4S)(DMF)] (II; DMF=N,N′‐dimethylformamide). Single‐crystal structure studies revealed that compound I has a three‐dimensional structure and compound II has a two‐dimensional structure. The luminescent nature of the MOFs was gainfully employed as a probe for the detection of highly toxic metal ions such as Tl3+ and Hg2+. The detection limits were found to be in the parts per billion (ppb) level. The presence of an unsubstituted thiadiazole ring in the ligand appears to help in the detection of these highly toxic metal ions in solution as the metal ions interact with S, which was revealed by Raman spectroscopic studies. The compounds were also found to be good candidates for the detection of highly oxidizing anions such as chromate, dichromate, and permanganate, again in ppb levels of concentration in solution. Magnetic studies on compound I indicate antiferromagnetic behavior. The variable‐temperature electrical conductivity studies indicate a semiconducting nature with comparable behavior to well‐known semiconductors such as CdSe, ZnTe, and GaP.
- Jana, Ajay Kumar,Natarajan, Srinivasan
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p. 1153 - 1163
(2018/04/10)
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- METHOD AND MEANS RELATING TO MULTIPLE HERBICIDE RESISTANCE IN PLANTS
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Methods for overcoming multiple herbicide resistance (MHR) in plants using inhibitors of GST suppression of Formula (I), novel chemical inhibitors of Formula (Ia), compositions comprising compounds of Formula (I), and uses and methods relating thereto.
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Page/Page column 85-86
(2009/04/25)
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- Benzo-2,1,3-thiadiazole-based, highly dichroic fluorescent dyes for fluorescent host-guest liquid crystal displays
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The highly dichroic fluorescent dyes 4,7-bis(p-alkoxyphenyl)-, 4,7-bis(p-alkoxymethylphenyl)-, and 4,7-bis(p-alkoxycarbonylphenyl)-2,1,3- benzothiadiazoles have been synthesized and their dichroic properties evaluated. A solution of the former dye dispersed in the commercial liquid crystalline MLC-2039 host phase showed a dichroic ratio value for fluorescence up to 9.1.
- Zhang, Xuelong,Gorohmaru, Hideki,Kadowaki, Masami,Kobayashi, Takako,Ishi-I, Tsutomu,Thlemann, Thies,Mataka, Shuntaro
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p. 1901 - 1904
(2007/10/03)
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