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WGXloveHYY新虫 (小有名气)
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[求助]
碳锌键这种结构在哪些领域可以得到应用，并且对应用的影响。急急急 已有1人参与
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碳锌键这种结构在哪些领域可以得到应用，并且对应用的影响。急急急 @Gamry-电化学 发自小木虫IOS客户端 |
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WGXloveHYY(小毛球代发): 金币+3, 感谢参与 2018-12-07 07:24:29
感谢参与，应助指数 +1
WGXloveHYY(小毛球代发): 金币+3, 感谢参与 2018-12-07 07:24:29
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有机锌化合物是指含有碳－锌化学键的一类有机化合物： https://zh.wikipedia.org/wiki/%E ... 6%E5%90%88%E7%89%A9 碳锌电池： https://zh.wikipedia.org/wiki/%E ... C%E7%94%B5%E6%B1%A0 https://en.wikipedia.org/wiki/Zinc#Organic_chemistry： Organozinc chemistry is the science of compounds that contain carbon-zinc bonds, describing the physical properties, synthesis, and chemical reactions.Many organozinc compounds are important.[140][141][142][143] Among important applications are The Frankland-Duppa Reaction in which an oxalate ester (ROCOCOOR) reacts with an alkyl halide R'X, zinc and hydrochloric acid to form the α-hydroxycarboxylic esters RR'COHCOOR[144] The Reformatskii reaction in which α-halo-esters and aldehydes are converted to β-hydroxy-esters The Simmons–Smith reaction in which the carbenoid (iodomethyl)zinc iodide reacts with alkene(or alkyne) and converts them to cyclopropane The Addition reaction of organozinc compounds to form carbonyl compounds The Barbier reaction (1899), which is the zinc equivalent of the magnesium Grignard reaction and is the better of the two. In presence of water, formation of the organomagnesium halide will fail, whereas the Barbier reaction can take place in water. On the downside, organozincs are much less nucleophilic than Grignards, and they are expensive and difficult to handle. Commercially available diorganozinc compounds are dimethylzinc, diethylzinc and diphenylzinc. In one study,[145][146] the active organozinc compound is obtained from much cheaper organobromine precursors The Negishi coupling is also an important reaction for the formation of new carbon-carbon bonds between unsaturated carbon atoms in alkenes, arenes and alkynes. The catalysts are nickel and palladium. A key step in the catalytic cycle is a transmetalation in which a zinc halide exchanges its organic substituent for another halogen with the palladium (nickel) metal center. The Fukuyama coupling is another coupling reaction, but it uses a thioester as reactant and produces a ketone. Zinc has found many applications as catalyst in organic synthesis including asymmetric synthesis, being cheap and easily available alternative to precious metal complexes. The results (yield and ee) obtained with chiral zinc catalysts are comparable to those achieved with palladium, ruthenium, iridium and others, and zinc becomes metal catalyst of choice. |
2楼2018-12-07 00:31:05
