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Reaction of 5-aryl-2,3-dihydrofuran-2,3-diones with ketene ..:

Shurov, S. N. ; Livantsova, L. I. ; Pavlova, E. Yu....
Chemistry of Heterocyclic Compounds.  27 (1991)  11 - p. 1267-1267 , 1991
Link: https://doi.org/10.1007/bf00471763