The invention relates to a method for preparing vitamin D-related compounds and to certain intermediate compounds in such process. The intermediate compounds are characterized by an aldehyde or ester in the C-22 position in the side chain. The presence of such groups permit facile side chain additions...http://www.google.com.au/patents/US4847012?utm_source=gb-gplus-sharePatent US4847012 - Vitamin D related compounds and processes for their preparation
