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Diels-Alder cycloadditions of 1,3-cyclohexadien-4,5-diones(o-benzoquinones) with norbornadiene. Part I. Synthesis.
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1  Centre for Molecular Architecture, Central Queensland University, North Rockhampton, 4701, QLD, Australia

Abstract: Cycloadditions between o-chloranil and norbornadiene produced a range of geometrical variants which were characterised as quinoxaline derivatives. Two ether products were also observed resulting from hetero Diels-Alder reactions. Photochemical irradiation of 20 produced the cage compound 22 as a result of an internal (2+2)p cycloaddition.
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