作者:S. Oae、W. Tagaki、K. Uneyama、I. Minamida
DOI:10.1016/s0040-4020(01)96324-0
日期:1968.1
Several α-mercaptoacetic and related acids were synthesized and the rates of the amine-catalysed decarboxylation were measured. In the carbanion-forming reaction, the α-mercapto group exhibits a dramatic rate-enhancement, due to the 3d-orbital resonance effect of the divalent sulphide group. For example, the rate of the decarboxylation of diphenylmercaptoacetic acid was 8·8 × 103 fold greater than that
合成了几种α-巯基乙酸和相关酸,并测量了胺催化的脱羧速率。在形成碳负离子的反应中,由于二价硫化物基团的3d轨道共振效应,α-巯基基团表现出显着的速率增强。例如,二苯基巯基乙酸的脱羧速率比氧类似物二苯氧基乙酸的脱羧速率高8·8×10 3倍。而在苯巯基乙酸的α-位上取代一个苯巯基基团可以使速率加快1·7×10 3。这些结果可以与先前报道的各种硫化物的碱催化HD交换反应的结果相关1 并基于涉及二价硫化物中S原子的3d轨道共振进行了解释。