- One pot synthesis of aryl nitriles from aromatic aldehydes in a water environment
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In this study, we found a green method to obtain aryl nitriles from aromatic aldehyde in water. This simple process was modified from a conventional method. Compared with those approaches, we used water as the solvent instead of harmful chemical reagents. In this one-pot conversion, we got twenty-five aryl nitriles conveniently with pollution to the environment being minimized. Furthermore, we confirmed the reaction mechanism by capturing the intermediates, aldoximes.
- Chen, Qingqing,Han, Hongwei,Lin, Hongyan,Ma, Xiaopeng,Qi, Jinliang,Wang, Xiaoming,Yang, Yonghua,Zhou, Ziling
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p. 24232 - 24237
(2021/07/29)
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- Discovery and characterization of a novel perylenephotoreductant for the activation of aryl halides
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To develop a photocatalyst with catalytical activity for substrates with low reactivities is always highly desired. Herein, based on the principle of structure–property relationships, we rationally designed the natural product cercosporin, the naturally occurring perylenequinonoid pigment, to develop a novel organic perylenephotoreductant, hexacetyl reduced cercosporin (HARCP), through structural manipulation. Compared with cercosporin, HARCP shows prominent electrochemical and photophysical characteristics with greatly improved photoreductive activity, fluorescence lifetime and fluorescence quantum yield. These properties allowed HARCP as a powerful photoreductant to efficiently realize a series of benchmark reactions, including photoreduction, alkoxylation and hydroxylation to construct C–H and C–O bonds using aryl halides as substrates under mild conditions, all of which have never been achieved by the same photocatalyst. Thus, this study well supports the notion that the principle between structural manipulation and photocatalytic activity is of great significance to design customized photocatalysts for photoredox chemistry.
- Guo, Baodang,Huang, Shuping,Li, Jia,Li, Min,Liu, Xuanzhong,Rao, Yijian,Wu, Yawen,Yin, Huimin,Yuan, Zhenbo,Zhang, Yan
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p. 111 - 120
(2021/06/16)
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- Photoinduced Hydroxylation of Organic Halides under Mild Conditions
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Presented in this paper is photoinduced hydroxylation of organic halides, providing a mild access to a range of functionalized phenols and aliphatic alcohols. These reactions generally proceed under mild reaction conditions with no need for a photocatalyst or a strong base and show a wide substrate scope as well as excellent functional group tolerance. This work highlights the unique role of NaI that allows a challenging transformation to proceed under mild reaction conditions.
- Cai, Yue-Ming,Xu, Yu-Ting,Zhang, Xin,Gao, Wen-Xia,Huang, Xiao-Bo,Zhou, Yun-Bing,Liu, Miao-Chang,Wu, Hua-Yue
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supporting information
p. 8479 - 8484
(2019/10/16)
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- Synergistic Photo-Copper-Catalyzed Hydroxylation of (Hetero)aryl Halides with Molecular Oxygen
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Photoredox-mediated copper-catalyzed hydroxylation of (hetero)aryl halides (including chlorides, bromides, and iodides) with O2 at room temperature has been developed. Preliminary mechanistic studies indicate no arylcopper intermediate and that aryl radicals are involved in this procedure. 18O-labeling experiments confirm the hydroxyl oxygen atom originated from molecular oxygen.
- Zhang, Xin,Wu, Ge,Gao, Wenxia,Ding, Jinchang,Huang, Xiaobo,Liu, Miaochang,Wu, Huayue
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supporting information
p. 708 - 711
(2018/02/09)
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- Phenol compound and preparation method
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The invention relates to a phenol compound and a preparation method. In an organic solvent, aryl halide and oxygen or air are used as reaction raw materials, and under the combined facilitation effectof a copper catalyst, alkali and an additive, the aryl halide and the oxygen react in illumination of light to obtain the phenol compound. The copper catalyst and the alkali have key effects in a reaction process. The preparation method of the phenol compound has the advantages of wide substrate range, operation at room temperature, simple aftertreatment, high yield and purity of products and thelike. A new synthetic route and method are opened for the phenol compound, and thus, the phenol compound has good application potential and research value.
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Paragraph 0097-0100
(2018/04/27)
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- Hydroxyamidine derivatives
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The invention relates to the compounds of the formula STR1 wherein the C(=NOH)-NH2 group may be in tautomeric form, and pharmaceutically acceptable salts thereof, in which: R1 is amino or amino which is mono- or disubstituted by a su
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- The Synthesis and Transition Temperatures of Benzoate Ester Derivatives of 2-Fluoro-4-hydroxy- and 3-Fluoro-4-hydroxybenzonitriles
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The synthesis and the liquid-crystal temperatures of sixty 4-cyano-2-flurophenyl and 4-cyano-3-fluorophenyl 4-substituted benzoates are described.The nematic-isotropic liquid transition temperatures of most of these novel esters are only marginally lower than those of the corresponding esters containing an H-atom in place of the F-substituent.In several instances, the clearing points of the F-substituted-phenyl esters are higher than those of the non-substituted-phenyl esters.The nematic ranges of several new esters are markedly broader than those of the analogous non-F-susbstituted-phenyl esters.
- Kelly, Stephen M.
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p. 1572 - 1579
(2007/10/02)
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- SYNTHESIS AND SOME PROPERTIES OF 3-FLUORO-4-CYANOPHENYL 4 prime -n-ALKYLBENZOATES.
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A series of 3-fluoro-4-cyanophenyl 4 prime -n-alkylbenzoates, which show monotropic nematic phases, was prepared and their transition temperatures and melting enthalpies were measured. The 3-fluoro-4-cyanophenyl 4 prime -n-propylbenzoate, 3-chloro-4-cyanophenyl 4 prime -n-propylbenzoate and 4-cyanophenyl 4 prime -n-propylbenzoate were mixed with a nematic mixture (A) of 4-n-alkoxyphenyl 4 prime -n-alkylcyclohexane-1 prime -carboxylates. 3-Fluoro-4-cyanophenyl 4 prime -n-propylbenzoate decreases the N-I transition temperature less, increases the birefringence more, and increases the bulk viscosity less than 3-chloro-4-cyanophenyl 4 prime -n-propylbenzoate, and reduces the threshold voltage to the greatest extent. The dielectric anisotropies of 3-fluoro-4-cyanophenyl 4 prime -n-propylbenzoate and 4-cyanophenyl 4 prime -n-propylbenzoate determined from a series of solutions of the compounds in nematic mixture (A) are 35. 9 and 29. 6, respectively.
- Sasaki,Takeuchi,Sato,Takatsu
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p. 169 - 178
(2007/10/02)
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- The Synthesis and Liquid Crystal Properties of Some Laterally Fluorinated trans-Cyclohexane-1-carboxylate and Benzoate Esters
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A large number of laterally fluorinated 4-n-alkyl- and -alkoxy-phenyl 4'-n-alkyl- and -alkoxy-bezoates and 4-n-alkylphenyl trans-4'-n-alkyl- and -alkoxy-cyclohexane-1-carboxylates were synthesised.In these compounds, the lateral fluoro-substituent was situated in either the phenol or the carboxylic acid moiety of the molecules for the benzoate esters, but only in the phenol moiety for the trans-cyclohexane-1-carboxylate esters.The nematic thermal stabilities for the fluorophenyl bezoate and trans-cyclohexane-1-carboxylate esters and the fluorobenzoate esters were compared with those for the corresponding non-fluorinated analogues.A nematic thermal efficiency order was derived for the 4-n-alkyl-fluorophenyl 4-n-alkylbezoate and trans-4-n-alkylcyclohexane-1-carboxylate esters, but only in the case of the latter esters, which were extensively examined, was the smectic tendency of the system investigated.Explanations are given for the observed nematic and smectic thermal stabilities of the titled esters, and some of their physical properties are discussed.
- Gray, G. W.,Hogg, C.,Lacey, D.
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