24,24-difluoro-25-hydroxycholecalciferol

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

204/91.05, 260/6

C07C 172/00 (1980.01)

Patent

CA 1159850

ABSTRACT A process for the preparation of 24,24-difluoro-25- hydroxy-previtamin D3 of the formula: Image which comprises irradiating a compound of the formula: Image and isolating the desired compound from the reaction mixture. The previtamin D3 is useful in the preparation of 24,24-di- fluoro-25-hydroxy-vitamin D3.

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