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The hydrolysis of acetic anhydride in acetone-water is strongly catalysed by small amounts of pyridine. The dependence of the reaction velocity on the concentrations of pyridine and acetic anhydride appears complex but is satisfactorily explained if the formation of catalytically inactive pyridinium acetate (by interaction of the catalyst and the product of reaction) is allowed for.IT is common knowledge that many preparative acylations are facilitated by the presence of alkali, carboxylate ions, or tertiary amines such as pyridine. The mechanism of the catalysis, superficially suggestive of general base catalysis, has not so far been elucidated and only a few isolated kinetic studies of the phenomena have been reported (e.g.

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The u.v. absorption spectra of 22 monosubstituted and 19 disubstituted benzoic acids have been studied in water or aqueous dioxan over a pH range of about 1–8. The isosbestic points have been measured and the results are discussed.