A new route for the preparation of 10,11-dihydro-5H-dibenzo[a,d]cycloheptene using Friedel-Crafts intramolecular cyclobenzylation

A convenient preparation of 10,11-dihydro-5H-dibenzo[a,d]cycloheptene based on a novel Friedel-Crafts intramolecular cyclobenzylation, involving five steps from 1,2-diphenylethane, is described