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8Condensation of 3,3-dichloroacrolein with carbonyl compounds and conversion of the condensation products into 2H-pyran-2-one derivatives, Bulletin of the Academy of Sciences of the USSR, Division of chemical science Halo-2-pyrones in the Ullmann reaction. 1, Chemistry of Heterocyclic Compounds Iodination of 6-aryl-2-pyrones, Chemistry of Heterocyclic Compounds Some reactions of 6-phenyl-2H-pyran-2-one, Bulletin of the Academy of Sciences of the USSR, Division of chemical science Preparation of 6-substituted 2H-pyran-2-ones via 3,3-dichloroacrolein and its chloroacetals, Bulletin of the Academy of Sciences of the USSR, Division of chemical science