[2 +2] Photocycloaddition of acetylacetone to naphthoates: a diverse addition pattern
Abstract
Acetylacetone photolytically adds to 1- and 2-naphthoates with or without acid catalysis by the [2 + 2] mode resulting in divergent regioselectivities; the structure of a secondary intramolecular cyclization product was ascertained by means of X-ray crystallography.