Is phenyl a good migrating group in the rearrangement of organoborates generated from sulfur ylides?
作者:Raphaël Robiette、Guang Yu Fang、Jeremy N. Harvey、Varinder K. Aggarwal
DOI:10.1039/b514987h
日期:——
show that the unexpected low phenyl migratory aptitude observed in reactions of mixed alkyl-aryl boranes with benzylic sulfur ylides can be attributed to (1) a conformational issue, (2) the reduction of the usual neighbouring effect of the phenyl in the transition state by the benzylic nature of the migrating terminus, (3) steric hindrance suffered by the larger phenylgroup migrating to the hindered