Issue 0, 1968

Chlorination of αβ-unsaturated carbonyl compounds. Part III. Reaction of chlorine with trans-cinnamic acid and the trans-cinnamate ion

Abstract

The addition of chlorine to trans-cinnamic acid in acetic acid and in acetic acid containing lithium chloride, lithium perchlorate, or perchloric acid is very similar to that observed for methyl trans-cinnamate. A similar mixed mechanism, involving a direct addition of chlorine and collapse of, and reaction of the solvent with, an ion-pair and chloronium ions, is proposed. No acid-catalysis other than a salt effect is observed. In acetic acid containing lithium acetate, the addition products are accompanied by trans-β-chlorostyrene, 1,2,2-trichloroethylbenzene, and 1-acetoxy-2,2-dichloroethylbenzene. The chlorostyrene is formed by a direct reaction of the trans-cinnamate ion with chlorine, and not by elimination of carbon dioxide from the addition products or from the intermediate ion-pairs. The ethylbenzene derivatives are formed by further chlorination of the chlorostyrene. The trans-cinnamate ion also undergoes chlorodecarboxylation in aqueous solution, whereas trans-cinnamic acid undergoes addition of hypochlorous acid (or chlorine monoxide) or of chlorine, depending upon the method of mixing the reagents.

Article information

Article type
Paper

J. Chem. Soc. B, 1968, 1022-1026

Chlorination of αβ-unsaturated carbonyl compounds. Part III. Reaction of chlorine with trans-cinnamic acid and the trans-cinnamate ion

M. C. Cabaleiro, M. D. Johnson, B. E. Swedlund and J. G. Williams, J. Chem. Soc. B, 1968, 1022 DOI: 10.1039/J29680001022

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