Abstract
The emphasis placed on electron transfer in connection with oxidation reactions has often resulted in these processes being considered as a group apart from the main class of chemical reactions. Although some oxidations, for example certain exchange reactions between ions in solution, can be reasonably described as electron transfer processes, there are very many other oxidations, whose mechanisms are much better described in the familiar terms of modern organic chemistry.
The use of isotopes as tracers has shown, that many oxidations proceed with transfer of atoms or groups from oxidant to reductant andvice versa; the use of the kinetic isotope effect has shown that such transfer is seldom an incidental process, but is almost always a part of the slow step of the reaction. In this paper, oxidations involving the transfer of such species as oxygen atoms, hydride ions, hydrogen atoms, chlorine atoms, and hydroxyl radicals are discussed in terms of mechanism. An attempt is made to show that a graded series of mechanisms is possible ranging from what appear to be pure electron transfer processes at one end to certain atom transfer processes at the other. The latter group belong, in fact, in the familiar realm of ordinary chemical raactions, in which strong bonds are being broken and formed in the activated complex.
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Additional information
Contribution from Department of Chemistry, University of British Columbia, Vancouver. — Presented at the Organic Chemistry Symposium of the Chemical Institute of Canada, Ottawa, Dec. 8–9, 1958.
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Stewart, R. Atom transfer mechanisms in oxidation processes. Experientia 15, 401–406 (1959). https://doi.org/10.1007/BF02158977
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DOI: https://doi.org/10.1007/BF02158977