Abstract
Abstract Irradiation of 2-acetonyl-3-alkoxy-1,4-naphthoquinones in benzene gave 2-alkyl-substituted 4-methylnaphtho[2,3-d]-1,3-dioxepin-6,11-dione and 2-acetonyl-3-hydroxy-1,4-naphthoquinone via intramolecular hydrogen-abstraction reaction. Irradiation of quinones in methanol, however, gave the latter product exclusively.
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