Regioselective Superacid-Catalyzed Electrocyclizatio nof Diphenylmethyl Cations to Fluorenes,Phenanthrols and Benzofurans

摘要

Cationic electrocyclization of #alpha#-benzoyldiphenylmethanols in the presence of superacid provides fluorenes,phenanthrols and benzofurans in good to moderate yields.A single substitution leads to regiosleective cationic electrocyclizations.