Steroid and triterpenoid ketones can be smoothly dehydrogenated in high yield with benzeneseleninic anhydride in chlorobenzene at 95–120 °C. With an excess of benzeneseleninic anhydride and longer reaction times 4,4-dimethyl ketones give ring-A-contracted diketones in moderate yield.
D. H. R. Barton, D. J. Lester and S. V. Ley, J. Chem. Soc., Perkin Trans. 1, 1980, 2209 DOI: 10.1039/P19800002209
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