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Carbon isotope effect studies in the mechanism of reactions of alkynes with formic acid

II.13C fractionation in the decarbonylation of Merck formic acid in the presence of phenylacetylene

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Abstract

The13C fractionation has been studied in the reaction of phenylacetylene with the excess of liquid Merck formic acid at 30 and 40 °C to see the contribution of the13C fractionation in the formolysis of transient α-formoxystyrene to the experimentally observed global13C fractionation. The13C fractionation has been investigated also in the hydration of 1 ml of PhC≡CH with 1 ml of formic acid in the temperature interval of 80–100°C. The13C KIE equal to 1.0168 at 91.75 °C and 1.0167 at 100°C indicate that the self-decomposition of formic acid in such experimental conditions is already largely suppressed. The isotope effect is discussed within the framework of the sequence of reaction steps leading to acetophenone and carbon monoxide production listed in part I.

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Authors and Affiliations

  1. Isotope Laboratory (Laboratory of Nuclear Chemistry), Faculty of Chemistry, Jagiellonian University, Cracow, Poland

    M. Zieliński, A. Zielińska, H. Papiernik-Zielińska, G. Czarnota, J. A. McKenzie & H. Paul

  2. Laboratory of Stable Isotopes, Geologisches Institut, ETH Zentrum, CH-8092, Zürich, Switzerland

    G. Kasprzyk & S. Bernasconi

Authors
  1. M. Zieliński
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  2. A. Zielińska
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  3. H. Papiernik-Zielińska
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  4. G. Czarnota
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  5. G. Kasprzyk
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  6. J. A. McKenzie
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  7. H. Paul
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  8. S. Bernasconi
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Zieliński, M., Zielińska, A., Papiernik-Zielińska, H. et al. Carbon isotope effect studies in the mechanism of reactions of alkynes with formic acid. J Radioanal Nucl Chem 223, 41–45 (1997). https://doi.org/10.1007/BF02223361

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  • DOI: https://doi.org/10.1007/BF02223361

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