Steroids. Part XIII. Boron trifluoride-catalysed rearrangement of 3β-acetoxy-5,6α-epoxy-19-methyl-5α-cholestane
Abstract
In contrast to 3β-acetoxy-5,6α-epoxy-5α-cholestane, the title compound (3) gives a low yield of 5α-hydroxy-6β-fluoro-compound and little backbone-rearranged compound. The products are diverse and suggest the intermediacy of a discrete C(5) carbonium ion.