Use of fragmentation probes in a study of the reduction reactions of 8-B-4 complexes
作者:Dennis D. Tanner、Guo Jian Xie、John Hooz、Chi Ming Yang
DOI:10.1021/jo00077a042
日期:1993.12
The reduction of a number of mechanistic probes with several borate complexes, NaBH4, Li(C2H5)3-BH, and lithium dimesityl borohydride, has been shown to occur by both an electron transfer-hydrogen atom abstraction mechanism and a hydride transfer process. Although the electron transfer-hydrogen atom abstraction mechanism can nearly always be detected or be initiated, it is usually only a minor reaction, and only when the reducing agent and/or the substrate is sterically hindered or when the acceptor is a strong oxidizing agent is the homolytic pathway preferred.