Phenylpropiolic acids, containing suitable electron releasing groups, react with oxalyl chloride, to give the chloroarylidenetetrahydrofuran-2,4,5-triones (II).
L. Crombie, R. G. Havard and D. P. Reynolds, J. Chem. Soc., Chem. Commun., 1973, 265a DOI: 10.1039/C3973000265A
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