“…The photochemical reactions of quinones mostly involve C–O bond formation reactions between photoexcited quinone carbonyl-derived oxygen atoms and carbon atoms, although a few C–C bond formation reactions have also been reported. For example, photoredox reactions have been reported for vitamin K conjugates, which are p -quinones with an isoprenyl group and naphthoquinones. , In addition, we previously reported an intramolecular photoredox reaction that proceeded via the fluorescent-light irradiation of a dichloromethane solution of methoxy p -quinone to form a 1,3-dioxole ring (Scheme , eq 1) . The photochemical reactions of these quinones are believed to be initiated by the Norrish type II 1,5-H abstraction of the proximate hydrogen by a photoexcited alkoxy radical, as reported by Edwards and Ho .…”