3α-Hydroxy-5,6-epoxycholestanes gave 6-hydroxy-3α,10α-oxido-5β-methyl-19-nor compounds in addition to 6-ketones and backbone rearranged Δ13(17)-olefins on BF3-catalysed rearrangement. Similar treatment of 3α-acetoxy-5β,6β-epoxycholestane gave 5α-acetoxy-cholestane-3α,6β-diol.
3α-羟基-5,6-环氧胆甾烷除了6-酮和在BF 3催化的骨架上重排的Δ13 (17)-烯烃外,还产生6-羟基-3α,10α-氧化-5β-甲基-19-nor化合物。。对3α-乙酰氧基-5β,6β-环氧胆甾烷进行类似处理,得到5α-乙酰氧基-胆甾烷-3α,6β
-二醇。