En. Koz'Minykh et al., Chemistry of 2-methylene-2,3-dihydrofuran-3-ones: XVIII. Reaction of oxalyl chloride with acetophenone and dihenzoylmethane, RUSS J ORG, 37(1), 2001, pp. 116-118
Treatment of acetophenone and dibenzoylmethane with excess oxalyl chloride
gave heterocyclization products, 2-(3-oxo-5-phenyl-2,3-dihydrofuran-2-ylide
ne)-5-phenyl-2,3-dihydrofuran-3-one and a mixture of 4-benzoyl-5-phenyl-2,3
-dihydrofuran-2,3- with 4-benzoyl-2-dibenzoyImethylene-5-phenylhydrofuran-3
-one.