Abstract
The carbon-14 kinetic isotope effect for the decarbonylation of lactic acid[1-14C] in sulfuric acid has been measured in the temperature interval of 20–90°C. The experimental values of (k12C/k14C) are compared with the theoretical14C kinetic isotope effect calculated assuming that one carbon-oxygen stretching vibration is lost in the rate-determining step. The discrepancy between experimentally observed temperature dependence of the14C kinetic isotope effect and the theoretical one is explained by the possible side reactions which change the apparent degrees of decarbonylation and isotopic composition of CH3CHOHCOOH[1-14C] used in experiments aiming at the determination of carbon-14 kinetic isotope effect in the decarbonylation process itself.
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