(24S)- and (24R)-1.alpha.,25-Dihydroxyvitamin D.sub.4 compounds and processes for preparing same. Ergosta-5,7-diene compounds which are useful intermediates in the synthesis of the 1.alpha.,25-dihydroxyvitamin D.sub.4 compounds. The D.sub.4 compounds are expected to possess an interesting pharmacological activity in association with the active-type vitamins D.sub.3 and D.sub.2.
(24S)-和(24R)-1.alpha.,25-二羟基
维生素D.sub.4化合物及其制备过程。Ergosta-5,7-二烯化合物是合成1.alpha.,25-二羟基
维生素D.sub.4化合物时有用的中间体。预计D.sub.4化合物与活性
维生素D.sub.3和D.sub.2一起具有有趣的药理活性。