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US 4,001,096 AGranted
Process for preparing 25-hydroxycholecalciferol intermediates
AssigneeThe Upjohn Company
InventorWilliam G. Salmond
Life of this patent
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Abstract
A method for preparing 9.beta., 10.alpha.-cholesta-5,7-diene-3.beta.,25 diol and 25-hydroxyprevitamin D.sub.3 by irradiation.
Claims5
A method for preparing 9.beta.,10.alpha.-cholesta-5,7-diene-3.beta.,25-diol which comprises irradiating cholesta-5,7-diene-3.beta.,25-diol and recovering crystalline 9.beta.,10.alpha.-cholesta-5,7-diene-3.beta.,25-diol from the reaction mixture.
A method for preparing 25-hydroxyprevitamin D.sub.3 ##STR3## which comprises a. dissolving crystalline 9.beta.,10.alpha.-cholesta-5,7-diene-3.beta.,25-diol in an organic solvent,
- b. irradiating the solution of 9.beta.,10.alpha.-cholesta-5,7-diene-3.beta.-25-diol.
Dependencies are inferred from the claim text.