Free??radical reactions of diazonium salts with α, β??unsaturated carbonyl compounds. A new synthesis of 1, 4??diarylpyrazole derivatives

A Citterio, M Ramperti, E Vismara

Index: Citterio, Attilio; Ramperti, Massimo; Vismara, Elena Journal of Heterocyclic Chemistry, 1981 , vol. 18, p. 763 - 766

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Citation Number: 14

Abstract

Abstract Free-radical decomposition of diazonium salts catalyzed by titanous or titanous and ferrous salts in the presence of β-substituted α, β-unsaturated carbonyl compounds leads to 1, 4-diarylpyrazole derivatives. The reaction occurs via an intermediate azo compound (1), which can be reduced by the metal salt or can be isolated and hydrogenated to pyrazole derivatives.