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The reactions with BF₃-etherate of the epoxides from 3,3-ethylenedioxy-6-methyl-cholest-5-ene(11) and 3,3-ethylenedioxy-cholest-5-ene(10) with BF₃-etherate in benzene have been studied. The reaction of 3β-acetoxy-5,6α-epoxy-5α-cholestane(2) with BF₃-etherate gave, as the major product, the "Backbone" rearranged structure(66) isolated as the dimeric ether (55). Further such rearranged compounds were obtained from the Lewis acid-catalyse reactions of 5,6α-epoxy-5α-cholestane (1),doi:10.26021/8629 fatcat:5zrbtrpf45gm5lmxa3dboctmue