THE 1,4-ADDITION OF SINGLET OXYGEN TO 2,6-DIMETHOXY-1-(2-METHOXYETHENYL)-BENZENE AND 2-METHOXY-1-(2-METHOXYETHENYL)NAPHTHALENE. THE 1,4-ENDO-PEROXIDES AS EQUIVALENTS OF 6-OXO-2,4-CYCLOHEXADIENYLIDENACETATES.

Article abstract of DOI:10.1016/S0040-4039(01)81877-3

The sensitized photooxygenation of vinylarenes 1 and 2 gave the corresponding 1,4-endoperoxides which were decomposed under mild conditions into quinone methides bearing ester function at the exocyclic carbon.