A double 1,2-rearrangement of a 12-oxo-beyer-15(16)-ene system across the 12,13-single bond, reversible after reduction of the double bond, is confirmed by X-ray crystal structural analysis.
M. Laing, P. Sommerville, D. Hanouskova, K. H. Pegel, L. P. L. Piacenza, L. Phillips and E. S. Waight, J. Chem. Soc., Chem. Commun., 1972, 196 DOI: 10.1039/C39720000196
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