Abstract
AbstractThe rate constants and free energies of activation of Zn2+ ‐accelerated and Cr3+ ‐retarded condensations of resorcinolic A rings of polyflavonoid wattle tannins, as well as of the model compounds resorcinol and catechol with formaldehyde, were determined. A quantitative indication of the effect of strong metallic ion catalysts on phenol/aldehyde reactions was obtained. Second‐order kinetics have been found to fit these metallic ion‐catalyzed reactions. The dependence of the tannin/formaldehyde reaction on the concentration of Zn2+ and Cr3+ under acid and alkaline reaction conditions has been investigated and the respective catalytic coefficients determined. In the presence of the metallic ions used the reaction proved to be considerably less sensitive to variations of OH‐concentration, hence of pH.
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