Abstract
Infra-red spectra of the vapours of pyruvic acid, methyl-, dimethyl- and trimethyl-pyruvic acid at temperatures between 90° and 180° has been investigated. It has been shown that α-ketoacids exist even at these temperatures to a considerable extent as proton-chelates. Thermodynamic data on the equilibrium between open ketoform and proton-chelate has been spectroscopically estimated. By use of carboxyl-deuterated trimethyl-pyruvic acid it was possible to calculate the different formation-enthalpies of the deuteron and proton chelate.
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