Abstract
THERE have been several reports of carbon isotope effects during the decarboxylation of dibasic carboxylic acids such as malonic acid1. Similar effects would be expected in the radical reaction: 
The rate at which the radical R.14CO.O dissociates is expected to be less than that for the corresponding reaction of the radical R.12CO.O.
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References
Melander, L., Isotope Effects on Reaction Rates, 132 (Ronald Press Co., New York, 1960).
Bevington, J. C., Radical Polymerisation, 41 (Academic Press, London, 1961).
Allen, J. K., and Bevington, J. C., Polymer, 2, 265 (1961).
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BATES, T., BEVINGTON, J. A Carbon Isotope Effect in the Decarboxylation of the Anisoyloxy Radical. Nature 197, 1294–1295 (1963). https://doi.org/10.1038/1971294a0
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DOI: https://doi.org/10.1038/1971294a0
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