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The synthesis of 11-methyl-3-oxa-tricyclo[5.2.2.0 1,5 ]undecenones and their photochemical reactions upon triplet ( 3 T) and singlet ( 1 S) excitation is described. Oxidation of hydroxymethylphenol gave a ketoepoxide by intramolecular cycloaddition. Manipulation of the oxirane ring furnished the chromophoric systems. Triplet excitation of these gave tetracyclic compounds...
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