Keten reacts homogeneously in the gas phase with carboxylic acids between 95 and 216 °C to give anhydrides in a reaction which is first order in keten and in acid monomer. Rates of reaction increase with increasing alkyl substitution and branching in the acid. This increase does not correlate well with the pKa values of the acids but runs parallel to their gas-phase acidities.
P. G. Blake and M. B. Vayjooee, J. Chem. Soc., Perkin Trans. 2, 1976, 988 DOI: 10.1039/P29760000988
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