The photo-induced stereospecific formation of 9-ethyl-1,4a-dimethyl-4,4a-dihydrocarbazole from N-ethyl-2,6-dimethyldiphenylamine and its photoreactions
Abstract
The light-induced ring closure reaction of N-ethyl-2,6-dimethyldiphenylamine to 9-ethyl-1,4a-dimethyl-4,4a-dihydrocarbazole, (3), and the light-induced ring opening of (3) to give butadienylindoles was found to proceed stereospecifically and in accordance with the Woodward–Hoffmann rules.