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.
这项发明提供了新型1.alpha.-羟基
维生素D化合物及其从1.alpha.-羟基-25-氢胆甾-5,7-二烯经辐射和异构化技术制备的方法。该发明还包括所述的1.alpha.-羟基-25-氢胆甾-5,7-二烯和相应的胆甾-5-烯。这些新化合物可以以结晶形式获得,基本上不含由制造过程产生的异构体或其他杂质。