The trimethylstannyl substituent raises the migratory aptitude of a primary β-carbon to be above that of a not otherwise activated secondary or tertiary carbon. This is apparent from the exclusive formation of the alkene acids 9â11 from BaeyerâVilliger reaction of the β-stannyl cyclohexanones 3â5. The stereoelectronic requirements of the stannyl-directed BaeyerâVilliger reaction were investigated using the axial β-trimethylstannylcyclohexanone 20.
三甲基锡基取代基提升了初级β-
碳的迁移能力,使其高于未被其他方式活化的次级或三级
碳。这一点从Baeyer-Villiger反应中β-
锡基
环己酮3-5独占性生成
烯酸9-11中可见一斑。使用轴向β-
三甲基锡基
环己酮20研究了
锡基引导的Baeyer-Villiger反应的立体电子要求。