of 17-bromo-20-keto pregnanes and the 17-methyletianic esters have been determined. The Faworskii rearrangement of the former to give the latter has been observed to be abnormal. It is suggested that C-17 → C-21 halogen transfer intervenes.
已经确定了17-
溴-20-酮孕烷和17-甲基酯的构型。观察到前者的Faworskii重排给出后者是异常的。建议进行C-17→C-21卤素转移。