Studies Involving Isotopically Labelled Formic Acid and its Derivatives.1 II. Relation of the Absolute Reaction Rates to the Magnitudes of the Isotope Effects in the Oxidation of Formic-C13 Acid by Halogen Atoms

Autor:	Gus A. Ropp, D. A. Dominey, C. J. Danby
Rok vydání:	1957
Předmět:	Hydrogen Formic acid Carbon-13 Inorganic chemistry Analytical chemistry chemistry.chemical_element General Chemistry Biochemistry Chemical reaction Catalysis Reaction rate chemistry.chemical_compound Colloid and Surface Chemistry Isotope fractionation chemistry Kinetic isotope effect Halogen
Zdroj:	Journal of the American Chemical Society. 79:4944-4948
ISSN:	1520-5126 0002-7863
DOI:	10.1021/ja01575a031
Popis:	For two reactions of formic-C/sup 13/ acid in which the rate steps involve extraction of hydrogen by halogen atoms, the rate isotope effects, k/sub 12//k/syb 13/, have been carefully evaluated by methods involving mass spectrometric analysis of carbon-13 dioxide. The difference between the measured values of k/sub 12//k/sub 13/ for the two reactions has been found to be in the direction that the slower reaction shows the greater degree of isotope fractionation. This principle which has also been noted in earlier studies is discussed in terms of the possible residual carbon-to-hydrogen bonding to be expected in the activated states for the two reactions. (auth)
Databáze:	OpenAIRE
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