Product analysis and deuterium labelling experiments suggest that the critical intermediate in the reduction of ArCOCH2R with Zn/HCl is a zinc–carbene; this may be protonated to give ArCH2CH2R, converted into ArCHCHR by rearrangement, deprotonated to give a vinyl–zinc species, or captured by an alkene to give a cyclopropane.
产品分析和
氘标记实验表明,Zn / HCl还原ArCOCH 2 R的关键中间体是
锌-卡宾。可以质子化以生成ArCH 2 CH 2 R,通过重排将其转化为ArCH CHR,去质子化以生成
乙烯基锌物种,或被烯烃捕获以生成
环丙烷。