Mechanism of Azo Coupling Reactions XXXIII. pH??dependence and micromixing effects on the product distribution of couplings with 6??amino??4??hydroxy??2?? …

R Kaminski, U Lauk, P Skrabal…

Index: Kaminski, Rafal; Lauk, Urs; Skrabal, Peter; Zollinger, Heinrich Helvetica Chimica Acta, 1983 , vol. 66, # 7 p. 2002 - 2017

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Citation Number: 23

Abstract

Abstract Azo coupling of 6-amino-4-hydroxy-2-naphthalenesulfonic acid (1) with 3- trifluoromethyl-and 4-nitrobenzenediazonium ion in relative highly concentrated aqueous alkaline solutions gave ratios of aminoazo to hydroxyazo compounds which are much higher than expected on the basis of the acid-base pre-equilibria of 1. These product ratios are disguised by effects of micromixing. In dilute solution (≤ 10− 2 mol/l) product ratios ...