Methyl benzoate and methyl p-methoxybenzoate undergo processes of hydrogen abstraction and 2 + 2 cycloaddition with olefins to give, for example, the ketones (3) and (4), and the oxetan (2), respectively; these reactions apparently occur via excited singlet states of the esters.
T. S. Cantrell, J. Chem. Soc., Chem. Commun., 1973, 468 DOI: 10.1039/C39730000468
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