The acetylenic acetal (2) is converted in 90% yield to a mixture of cholesta-3,5- and 4,6-dienes on reflux in toluene containing toluene-p-sulphonic acid.
D. Keirs, K. Overton and K. Thakker, J. Chem. Soc., Chem. Commun., 1990, 310 DOI: 10.1039/C39900000310
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