(13)C kinetic isotope effects in the decarboxylation of phenylpropiolic acid (PPA) assisted with formic acid and (13)C KIE in the decarbonylation of formic acid in the presence of PPA

• Autorzy: Zieliński M. , Zielińska A. , Paul H. , Papiernik-Zielińska H.
• Języki publikacji: EN

Abstrakty

EN

Carbon-13 kinetic isotope effects, (13)C-KIE, in the decarboxylation of phenylpropiolic acid (carboxyl C-13) in formic acid medium and (13)C KIE in the decarbonylation of liquid formic acid assisted with PPA and acetophenone have been studied in the 70-100 degree C temperature interval. The kinetic and isotope results have been discussed and interpreted as indicating that the formation of C alpha-H bond, preceded by the protonation of acetylenic bond of PPA, is the rate determining step followed by carbon dioxide splitting. The (13)CO-KIE in the carbon monoxide generation assisted with PPA is much larger than the (13)CO-KIE observed in the generation of CO in the presence of phenylacetylene. Thus the decaeboxylation of PPA and decarbonylation of formic acid are interrelated processes proceeding in the reaction cage.

Słowa kluczowe

EN

phenylpropiolic acid; formic acid; decarboxylation; decarbonylation; activation parameters; carbon-13 kinetic isotope effects

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 1998
• Tom: Vol. 72, nr 12
• Strony: 2551--2555
• Opis fizyczny: Bibliogr. 12 poz., tab.

Twórcy

autor

Zieliński M.

autor

Zielińska A.

autor

Paul H.

autor

Papiernik-Zielińska H.

• Laboratory of Nuclear Chemistry, Faculty of Chemistry, Jagiellonian University, 30-060 Kraków, Poland