Appropriately substituted o-phenoxybenzoic esters on treatment with dry hydrogen chloride and titanium(IV) chloride in dichloromethane yield grisa-2′,5′-dien-3,4′-diones by intramolecular ipso-substitution.
M. V. Sargent, J. Chem. Soc., Chem. Commun., 1980, 285 DOI: 10.1039/C39800000285
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