Replacement of one fluorine atom of the hexafluorocholesterol derivative (4) with a methoxyl group took place during the saponification of the acetyl groups of 4 with methanolic potassium hydroxide to give the pentafluoromethoxy compound (5), which was converted to the corresponding 1α-hydroxyvitamin D 3 form (6). The pentafluoromethoxy compound (6) was found to be about three times more potent than 1 a-hydroxyvitamin D 3 in displacing ...
![(1R,5Z)-5-[(2E)-2-[(7aR)-1-[(2R)-6-[difluoro(methoxy)methyl]-7,7,7-trifluoroheptan-2-yl]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-4-ylidene]ethylidene]-4-methylidenecyclohexane-1,3-diol Structure](https://image.chemsrc.com/caspic/052/119839-97-3.png)
