title: Addition of dichlorocarbene to steroidal olefins. Preparation of a stereoisomer of demethylgorgosterol, a cyclopropane-containing marine sterol.
mesh_terms: D000475:Alkenes / Q000138:chemical synthesis; D002942:Circular Dichroism; D003521:Cyclopropanes / Q000138:chemical synthesis; D003525:Cyclosteroids / Q000138:chemical synthesis; D004875:Ergosterol / Q000138:chemical synthesis; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D009904:Optical Rotation; D009905:Optical Rotatory Dispersion; D013237:Stereoisomerism; D013261:Sterols / Q000138:chemical synthesis*
chemical_list: D000475:Alkenes; D003521:Cyclopropanes; D003525:Cyclosteroids; D013261:Sterols; D004875:Ergosterol