Photoinduced transformation of matrix-isolated methyl 2-pyrone-3-carboxylate into methyl 2-pyrone-5-carboxylate via intramolecular hydrogen shift in open-ring aldehyde – ketene


Photochemical transformations of methyl 2-pyrone-3-carboxylate (mp3c) were studied by matrix-isolation technique. The dominating primary photoreaction induced by UV (k > 295 nm) light was a-bond cleavage leading to open-ring aldehyde–ketene. Another reaction characteristic of a-pyrones, isomerisation to the Dewar form, did not occur for mp3c. The ring… (More)

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