2,4-Cyclohexadien-1-ones in organic synthesis. Intramolecular Diels-Alder reactivity and the oxa-di-.pi.-methane photorearrangement of Diels-Alder adducts
2,4-Cyclohexadien-1-ones in organic synthesis. Intramolecular Diels-Alder reactivity and the oxa-di-.pi.-methane photorearrangement of Diels-Alder adducts