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首页> 外文期刊>Chemistry: A European journal >C-H Functionalizations by Means of Direct Borane-Hydrocarbon Dehydrogenations and Dehydrocarbonations
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C-H Functionalizations by Means of Direct Borane-Hydrocarbon Dehydrogenations and Dehydrocarbonations

机译:通过直接硼烷烃脱氢和脱烃的C-H功能化

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摘要

The C-H functionalization of methane by means of direct C-H borations with BH3 or MeBH2 is compared computationally (using the B3LYP/6-311++G** method) to C-H lithiations with LiH or LiMe as well as to other analogue C-metal (Be, Na, Mg, Al) formations. For the borations only, this internal electrophilic substitution at carbon (S(E)i) relies more on the electrophilicity of boron than on the basicity of the internal base Y, that is, H or Me. Such direct borations of methane are more favored for dehydrogenations than for dehydrocarbonations. Due to decreased electrophilicity, substituents at boron disfavor such borations. Hence, the BH2 group appears to be most efficient for C-H functionalizations by means of direct hydrocarbon borations.
机译:通过使用BH3或MeBH2的直接CH硼化对甲烷的CH官能化进行了计算(使用B3LYP / 6-311 ++ G **方法)与使用LiH或LiMe以及其他类似的C-金属进行CH锂化反应进行了比较(是Na,Mg,Al)地层。仅对于硼酸酯而言,在碳上的这种内部亲电子取代(S(E)i)更多地依赖于硼的亲电子而不是内部碱Y(即H或Me)的碱度。甲烷的这种直接硼酸酯比脱烃更适合用于脱氢。由于亲电子性下降,硼上的取代基不利于这种硼酸酯化。因此,通过直接的烃硼酸酯化,BH 2基团对于C-H官能化看来是最有效的。

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