The photocycloaddition of acetylacetone with naphthols and their methyl ethers

Whereas irradiation of a mixture of a naphthol (or its methyl ether) and acetylacetone with excitation of the naphthol component leads to no reaction, irradiation of a similar mixture with excitation of the acetylacetone component leads to its cycloaddition to the naphthalene derivative to give a cyclobutane as the primary photoproduct.