The chloroarylidenetetrahydrofuran-2,4,5-trione (I) rearranges on heating to the aroylchloromaleic anhydride (II); a mechanism involving an oxet is suggested.
L. Crombie and D. P. Reynolds, J. Chem. Soc., Chem. Commun., 1973, 265b DOI: 10.1039/C3973000265B
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