Abstract

THE nitronium ion, NO2 +, has been shown to be the active nitrating entity in the O-nitration of certain alcohols in organic solvents1 in which nitric acid is present in large excess. Kinetic studies in progress on the esterification of isoamyl alcohol with nitric acid in 55–62 per cent aqueous perchloric acid have now indicated that here also O-nitration proceeds through the nitronium ion, although only a very small fraction of the nitric acid can be present in this cationic form in media of such high water-content. Rate measurements at 25° C. made by ultra-violet spectrometric analysis of the unchanged nitric acid after dilution of aliquots with water and extraction of the isoamayl nitrate product show that the rate equation (1) is obeyed:

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