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Free-Radical Reactions of Diazonium Salts with α,β-Unsaturated Carbonyl Compounds. A New Synthesis of 1,4-Diarylpyrazole Derivatives
Citterio, Attilio,Ramperti, Massimo,Vismara, Elena
, p. 763 - 766 (2007/10/02)
Free-radical decomposition of diazonium salts catalyzed by 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), whi