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Kinetics and Mechanism of the Addition of Benzylamines to alpha-Thiophenyl-beta-phenylacrylonitriles in Acetonitrile

机译:乙腈中的α-硫代苯基-β-苯基丙烯腈加成苄胺的动力学和机理

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摘要

Addition of amines(XRNH2)to olefins(YC6H4CH= CZZ')is known to proceed in acetonitrile by concerted formation of the C_(beta)-N and C_(alpha)-H bonds in a single-step process leading to a neutral product,I.This is,however,quite in contrast to the mechanism in aqueous solution,which occurs through a zwitterionic intermediate,II(T~(±)),with imbalanced transition states(TSs)in which the development of resonance into the activating(electron-acceptor)group(Z,Z')lags behind charge transfer of bond formation.
机译:已知将胺(XRNH2)加成烯烃(YC6H4CH = CZZ')会在乙腈中通过协调形成C_β-N和C_α-H键的一步法共同形成中性产物而在乙腈中进行然而,这与水溶液在水溶液中的机理相反,后者是通过两性离子中间体II(T〜(±))发生的,该中间体具有不平衡的过渡态(TSs),其中共振发展为活化(电子-受体)基团(Z,Z')落后于键形成的电荷转移。

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