Acetoxylation of 5α-cholestan-3-one by lead tetra-acetate–boron trifluoride in benzene–methanol gave a methyl ester (7%) by ring contraction together with 2α-acetoxycholestanone (47%). The ester was also obtained (11%) when 3,3-dimethoxycholestane was used as starting compound.
H. B. Henbest, D. N. Jones and G. P. Slater, J. Chem. Soc. C, 1967, 756 DOI: 10.1039/J39670000756
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