Abstract

Various mechanisms of hydrogen spillover are discussed. A number of evidences are given that tritium incorporation by isotope exchange occurs with the participation of both tritium cations and atomic tritium. The molar radioactivity of the labeled products prepared at temperatures of up to 180°C is, apparently, mainly determined by reactions of the organic compound with tritium cations, and the degree of isotope exchange depends chiefly on the efficiency of tritium spillover to the bulk of the organic substance supported on the catalyst.

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