The stabilisation of a developing cationic centre by an adjacent double bond has been found to direct the migration of the 10-methyl group to C-9 on cleavage of 9β,11β-epoxy-4,4-dimethylandrost-5-ene-3,17-dione.
J. W. ApSimon and J. M. Rosenfeld, J. Chem. Soc. D, 1970, 1271 DOI: 10.1039/C29700001271
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