Some of the methods available for comerting cholesterol into 7- dehydrochoJeateroI are reviewed for improving the yield of tmal product by modifying ditTerent steps. The allylic bromination of choleateryl benzoate was done with l,3-dibromo-S,s'ilimethylhydantoin. In the dehydrobromination of 7-bromocholeateryl benzoate an advantageous solvent namely ethyl benzoate was used for the isolation of 7-dehydrocholeateryl benzoate. The yield of provitamin D3 was 43% baaed on choleateryl benzoate.
F HUSSIAN ,M ALMA ,
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