Photo-oxidation of 3,4-diethylpyrrole in methanol gives mainly diethylmaleimide and 3,4-diethyl-5-methoxy-Δ3-pyrrolin-2-one; photolysis of pyrrole under similar conditions gives mainly 5-methoxy-Δ3-pyrrolin-2-one with a low yield of maleimide, but in aqueous solution, only 5-hydroxy-Δ3-pyrrolin-2-one and no maleimide is formed.
G. B. Quistad and D. A. Lightner, J. Chem. Soc. D, 1971, 1099 DOI: 10.1039/C29710001099
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