Chemical Selectivities Disguised by Mass Diffusion. VII. A simple model of pH‐dependence of product distribution in mixing‐disguised azo coupling reactions. 8th Communication on the selectivity of chemical processes

In the present work a mixing‐reaction model is developed to describe the influence of the space‐ and time‐dependent concentration of the leaving group on the pre‐equilibria of the reactants and thus on the product distribution of mixing‐disguised reactions. The modelling is carried out using a typical example of such reactions, namely azo coupling, where the leaving group is a proton. For this reaction, the existence of characteristic sets of parameters is established, for which the product distribution does not depend on the initial pH‐value. These sets of parameters define the isoselectivity points.