C13 ISOTOPE EFFECT IN THE DECARBOXYLATION OF NORMAL MALONIC ACID

C13 ISOTOPE EFFECT IN THE DECARBOXYLATION OF NORMAL MALONIC ACID

An investigation has been made of the relative rates of decarboxylation of two isotopic species of malonic acid, one containing only C 12 carbon atoms and the other containing a C 13 in a carboxyl position. Two effects were observed using malonic acid containing a normal abundance of C 13 (1) a 3.3%...

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Veröffentlicht in:Canadian journal of chemistry 1951-02, Vol.29 (2), p.192-200
Hauptverfasser: Lindsay, J. G, Bourns, A. N, Thode, H. G
Format: Artikel
Sprache:eng
Schlagworte:
Carbon
Carbon Radioisotopes
Decarboxylation
Isotopes
Malonates
Old Medline
Radioactivity
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Zusammenfassung:An investigation has been made of the relative rates of decarboxylation of two isotopic species of malonic acid, one containing only C 12 carbon atoms and the other containing a C 13 in a carboxyl position. Two effects were observed using malonic acid containing a normal abundance of C 13 (1) a 3.3% faster rate of reaction for the molecule containing only C 12 carbon atoms; (2) a 2% greater probability of rupture of a C 12 -C 12 bond than a C 12 -C 13 bond in the molecule containing a C 13 carbon. The latter effect was found to be independent of temperature. The magnitude of the isotope effect is in reasonable agreement with theoretical predictions.
ISSN:0008-4042
1480-3291
DOI:10.1139/v51-024