The invention provides novel 1.alpha.-hydroxy vitamin D compounds and a method for their preparation from 1.alpha.-hydroxy-25-hydrogen cholesta-5,7-dienes by irradiation and isomerization techniques. The invention also includes the said 1.alpha.-hydroxy-25-hydrogen-cholesta-5,7-dienes and the corresponding cholest-5-enes. The new compounds may be obtained in a crystalline form substantially free from isomeric or other impurities arising from manufacture.
本发明提供了新型的1α-羟基
维生素D化合物及其制备方法,该方法通过辐照和异构化技术从1α-羟基-25-氢基胆甾-5,7-二烯中制备。本发明还包括所述的1α-羟基-25-氢基胆甾-5,7-二烯和相应的胆甾-5-烯。新化合物可以以结晶形式获得,基本上不含有制造过程中产生的异构体或其他杂质。