Diels-Alder reaction of methyl acrylate and acrolein on cholesta-5, 7-dien-3β-ol acetate was carried out and the structure of the adduct thereby obtained was determined. Solvolysis of 3-methanesulfonate of these 5α, 8α-ethylene-steroids was carried out and retention of configuration was found to take place, whose mechanism was considered.
