23,23-Difluoro-1.alpha.,25-dihydroxy-vitamin D.sub.3

23,23-Difluoro-25-hydroxy-vitamin D.sub.3 and process for prepar

23,23-Difluoro-25-hydroxy-vitamin D.sub.3 and process for prepar

23,25-Dihydroxyvitamin D.sub.3

23-Dehydro-25-hydroxyvitamin D.sub.3

23-Hydroxy-3-oxo-24-norchola-4,17(20)-dien-21-oic acid .gamma.-l

24,24-Difluoro-1.alpha.,25-dihydroxycholecalciferol

24,24-Difluoro-25-hydroxycholecalciferol

24,25-Dihydroxycholestans and process for preparing the same

24-Cyclopropylcholene-3.beta., 22-diols and esters thereof

24-Methyl-14A -aza-D-homo-cholestadiene derivatives

24-Methyl-14a-aza-D-homo-cholest-8(9)-enes

24-Nor-1,4-choladiene-3,22-dione

24-Oxo-14a-aza-D-homo-cholestadiene derivatives

25-Alkyl-3.beta.-hydroxycholest-5-en-7-ones and esters thereof

25-Alkylcholest-5-ene-3 .beta.,22-diols and esters thereof

25-Alkylcholest-5-ene-3.beta.,22-diols and esters thereof

25-Desacetyl rifamycins

25-Halocholest-5-ene-3.beta.,22-diols and esters thereof

25-Hydroxy-24-oxocholestane derivatives and preparation thereof