| abstract |
(22E)-5,7,22-Ergostatriene-1α,3β,25-triol and the 24-epimer thereof which are new intermediates for the synthesis of 1α,25-dihydroxyvitamin D₂ and the 24-epimer thereof. A new process for the preparation of 1α,25-dihydroxyvitamin D₂ and the 24-epimer thereof is also described which comprises irradiation of (22E)-5,7,22-ergostatriene-1α,3β,25-triol or the 24-epimer thereof followed by isomerization. |