The nitric acid oxidation of the tetramethyl ester of the photoproduct of maleic anhydride with benzene yielded cyclobutanetetracarboxylic dianhydride. None of the expected unsaturated bicyclo-dianhydride was obtained.
L. Starr, J. Chem. Soc. C, 1967, 1111 DOI: 10.1039/J39670001111
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