| abstract |
Process for the preparation of calciferol derivatives of the formula <CHEM> wherein R is hydrogen and the dotted line in the side chain is an optional additional C-C-bond, or R is methyl and the dotted line in the side chain is an additional C-C-bond, in the 25R or 25S epimeric form or as mixtures thereof, starting from corresponding indenone derivatives; novel compounds falling under formula I and novel intermediates in the preparation of the compounds of formula I.n[EP0154185A1] |