M. Zieliński, A. Zielińska, H. Papiernik-Zielińska
Isotope Laboratory (Laboratory of Nuclear Chemistry), Faculty of Chemistry, Jagiellonian University, 3 Ingardena Str., 30-060 Krakow, Poland
A brief review of earlier 13C KIE studies of the decarbonylation of liquid formic acid (F.A.) and supplementary data concerning the 13C fractionation observed in the decomposition of this acid in the presence of inorganic dehydrating phosphoric acids and phosphoric anhydride are presented and discussed. The previous ad hoc interpretations of the experimental results are supported by more extensive numerical calculations relating to the cumulative 13C fractionation found in the carbon monoxide production in the presence of orthophosphoric acid, pyrophosphoric acid and P2O5 in liquid F.A. The full paper is given in the four internally related parts.