Arylhydrazones of 5α-cholestan-3-one and lanost-8-en-3-one are dehydrogenated by iodine and potassium t-butoxide, and by nitrobenzene or p-nitrobenzoic acid and potassium t-butoxide, to the 1,2-didehydro- or 1,2,4,5-tetradehydro-analogues respectively in high yield.
D. H. R. Barton, J. C. Coll, J. F. McGarrity and D. A. Widdowson, J. Chem. Soc., Perkin Trans. 1, 1973, 1565 DOI: 10.1039/P19730001565
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