Photoreactions of dispiro{naphthalene-1,2′-naphtho[2,1-b]pyran-3′,1″-naphthalene}-2(1H), 2″(1″H)-dione. A novel case of β-C–C cleavage in an enone
Abstract
Irradiation of the title compound (2) gave a wide range of products, identified as compounds (3)–(7) on the basis of spectroscopic data and chemical evidence, which result from β-cleavages and intramolecular cycloaddition.