Reaction of p-benzoquinone monoimines with benzoylacetanilides

Abstract

The kinetics of the reaction of 3-methylbenzoquinone 4-imine with N-benzoylacetyl-m-methoxycarbonylaniline in aqueous solutions has been investigated spectrophotometrically at 25 °C. The pH was varied from 7·5 to 10·0 and its effectassessed. Areaction scheme is suggested. The specific rate constants have been calculated for each step at different pH values by means of a computer. The calculated values agree with the reaction scheme. The pH-dependence of the specific rate constants shows that in a first step N-benzoylacetyl-m-methoxycarbonylaniline reacts with the monoimine in its undissociated form, and, secondly, with the product of the first step in a dissociated form.