Abstract
The dye-sensitised photo-oxygenation of 2,5-dimethylpyrrole in methanol yields the dealkylation products 5-methoxy-5-methyl-Δ3-pyrrolin-2-one and 5-methoxy-5-methoxymethyl-Δ3-pyrrolin-2-one in addition to the surprising structure, 2-formyl-2-methoxy-5-methylidene-Δ3-pyrroline; similar photo-oxidation of 2-methylpyrrole gives 5-methoxy-5-methyl-Δ3-pyrrolin-2-one as the major product.
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