The increase in kinetic isotope effect with temperature in diazo coupling reactions of NN-dimethylaniline and 3-methylaniline is attributed to partitioning of aminoazobenzene formation between two reactions, both of which involve molecular complex formation between the diazonium salt and amine nitrogen.
J. R. Penton and H. Zollinger, J. Chem. Soc., Chem. Commun., 1979, 819 DOI: 10.1039/C39790000819
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