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Chemical selectivities disguised by mass diffusion. V. Mixing-disguised azo coupling reactions. 6th communication on the selectivity of chemical processes

✍ Scribed by John R. Bourne; Eros Crivelli; Paul Rys


Publisher
John Wiley and Sons
Year
1977
Tongue
German
Weight
681 KB
Volume
60
Category
Article
ISSN
0018-019X

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✦ Synopsis


Abstract

The results of this study show that, for given initial and boundary conditions, four parameters are sufficient to describe the final product distribution of azo coupling reactions influenced by mixing. This is in agreement with the prediction of the mixing‐reaction model developed previously [4] [5]. In order to explain the pH‐dependence of the measured mixing‐disguised product distribution, it is necessary to assume that a selectivity‐determining, local pH‐gradient exists even though the solution is macroscopically buffered.


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Chemical Selectivities Disguised by Mass
✍ Hasan Belevi; John R. Bourne; Paul Rys 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 German ⚖ 473 KB 👁 1 views

## Abstract In mixing‐disguised azo coupling reactions the protons which are released during the electrophilic substitution steps cause a pH‐gradient in the reaction zone. Since, owing to the acid‐base pre‐equilibria, these pH‐gradients also determine the local concentrations of the reactants in th

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## Abstract The disguise of the intrinsic selectivity of competitive, consecutive reaction systems by the mixing process is demonstrated experimentally using the fast nitration of a number of aromatic compounds with nitronium salts in nitromethane. The measured product distributions were compared w

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## Abstract A simple mixing‐reaction model has been developed [1] which allows a description and simulation of the coupling of the mass diffusion with the chemical reaction during the mixing process of two miscible reactant solutions. For competitive, consecutive as well as for competitive, paralle