The structure of the allene obtained from mestranol methane sulphinate and methlycopper has been determinde by X-ray analysis; the allene turns out to be the 21α-Me compound, and not the erroneously reported 21β-Me epimer.
C. J. Elsevier, J. Meijer, H. Westmijze, P. Vermeer and L. A. van Dijck, J. Chem. Soc., Chem. Commun., 1982, 84 DOI: 10.1039/C39820000084
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