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Abstract

It has been found that the condensation rate of 1-amino-4-bromoanthraquinone-2-sulphonic acid (I) with 1,3-diaminobenzene-4-sulphonic acid (II) giving 1-amino-4-(3'-amino-4'-sulphoanilino)anthraquinone-2-sulphonic acid (III) in media of NaHCO₃-CO₂ and NaHCO₃-Na₂CO₃ with catalysis by CuI obeys the kinetic relation *u = k[I][II][Cu⁺][CO^2-₃], being controlled by the kinetic relation *u = k[I][II][Cu⁺]²[PO^3-₄] in media of NaH₂PO₄-Na₂HPO₄ buffers. The suggested reaction mechanism presumes formation of a bifunctional catalyst CuCO^-₃ or Cu₂PO^-₄ which splits off the proton and bromide anion from the reaction intermediate in the rate-limiting step.