Proton-catalysed rearrangement of 4,4-dimethyl-5α,13α-androst-7-ene proceeds with methyl migration to give 4,4,14α-trimethyl-18-nor-5α-androst-13(17)-ene. The mechanism of the reaction is discussed in comparison with the rearrangement of various triterpenoids. N.m.r. assignments for C–Me resonances are tabulated.
质子催化的4,4-二甲基-5α,13α-androst-7-ene的重排随着甲基的迁移而得到4,4,14α-三甲基-18-nor-5α-androst-13(17)-ene。与各种三
萜类化合物的重排比较,讨论了反应机理。列出了C–Me共振的Nmr分配。