It has been shown that cyclic enones undergo 2 + 2 cycloaddition to 1,3-dienes, frequently in high (0·1–0·3) quantum yield: this reaction appears to be responsible for erratic results sometimes obtained when 1,3-dienes are used as triplet quenchers.
T. S. Cantrell, J. Chem. Soc. D, 1970, 1656 DOI: 10.1039/C29700001656
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