73245-72-4

Upstream product

• 55105-86-7 19-acetoxyprevitamin D₃ acetate 
• 13640-06-7 cholesta-5,7-diene-3β,19-diol diacetate 

Downstream Products

• 73197-98-5 Acetic acid (S)-3-[2-[(1R,3aS,7aR)-1-((R)-1,5-dimethyl-hexyl)-7a-methyl-octahydro-inden-(4E)-ylidene]-eth-(Z)-ylidene]-4-formyl-cyclohexyl ester 
• 73197-99-6 (S)-2-{(E)-2-[(1R,3aS,7aR)-1-((R)-1,5-Dimethyl-hexyl)-7a-methyl-octahydro-inden-4-yl]-vinyl}-4-hydroxy-cyclohex-1-enecarbaldehyde 

Relevant academic research and scientific papers

Influence of Fluorine and Oxygen Atoms at C-19 on the Previtamin D-Vitamin D Interconversion

19,19-Difluorocholesteryl acetate (6), prepared by fluorination of 19-oxocholesteryl acetate (5), was converted to the respective 5,7-diene (7) which, on irradiation, gave both 19,19-difluoroprevitamin D3 (8) and 19,19-difluorotachysterol (9).O