Studies in Strained Polycyclic Systems: A Simple Synthesis of Novel Heptacyclic Diones:

Abstract
A simple synthesis of spirodiones (2)&(3) via n6s+ n2s photocyclization of the Deils-Alder adducts (4)&(5) obtained by reactions of spiro (4,2) heptadiene (6) and spiro (4,4) nonadiene (7) with 1,4- naphtho-quinone in homogeneous and micellar media. A remarkable catalytic effect by micelle on cycloaddition is noted.