Irradition of the 3-methoxyphthalaldehydate (4a) in methanol gives an excellent yield of the methoxyphthalide (1c) which can be converted into the 6-methoxyphthalaldehydate (3a) in excellent yield, thus effecting an ‘isomerization’ of the original phthalaldehydate.
M. E. Jung and R. B. Blum, J. Chem. Soc., Chem. Commun., 1981, 962 DOI: 10.1039/C39810000962
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