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A p-Tropoquinone acetal was prepared by the singlet oxygen-oxidation of an ethylene acetal of tropone, and was characterized as two endo-Diels-Alder adducts with cyclopentadiene, whose structures were... deduced by physicochemical data. Photochemical rearrangement of the acetal yielded a ring-contraction product, 2-hydroxyethyl (2,5-dioxo-3-cyclopentenyl) acetate. The same reaction with p-tropoquinone in methanol yielded methyl (2,5-dioxo-3-cyclopentenyl)acetate, along with photoreduced 5-hydroxytropolone.続きを見る
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Mendeley出力
