Condensation of 5α-ergost-7-en-3-one with ethyl formate is shown to give the 2-hydroxymethylene derivative (68% yield). This readily reacts further, forming the bis-2,4-hydroxymethylene compound (75%).
A. T. D. B. Andrews, M. W. Pemberton and G. D. Meakins, J. Chem. Soc. C, 1968, 2683 DOI: 10.1039/J39680002683
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