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.
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Barton et al. (1980) studied this question.