title: The action of triphenylphosphine dibromide on cholest-5-ene-3, 4 -diol, an unexpected vilsmeier reaction.
mesh_terms: D001965:Bromides; D055598:Chemical Phenomena; D002621:Chemistry; D002776:Cholestanes; D007202:Indicators and Reagents; D010084:Oxidation-Reduction; D010720:Phosphines
chemical_list: D001965:Bromides; D002776:Cholestanes; D007202:Indicators and Reagents; D010720:Phosphines