Dimethyl 2,5-dimethylterephethalate undergoes photoenolisation in the presence of oxygen to give the methoxyphthalide (II); the reaction apparently occurs by a process similar to the one observed with o-methylbenzophenones.
M. Julliard and M. Pfau, J. Chem. Soc., Chem. Commun., 1976, 184 DOI: 10.1039/C39760000184
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