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Hydrogen/Deuterium (H/D) Exchange Catalysis in Alkanes. The Journal of Organic Chemistry 2020, 85 Formation of Enamines via Catalytic Dehydrogenation by Pincer-Iridium Complexes. Lu, Xiawei Zhang, Santanu Malakar, Karsten Krogh-Jespersen, Faraj Hasanayn, Alan S. This article is cited by 26 publications. The existence of inverse EIEs in these systems at low temperatures is a result of the zero point energy changes for the products upon isotopic substitution being greater than those for the reactants (H 2 or CH 4). In contrast to oxidative addition of methane which is normal at all temperatures, the EIE for oxidative addition of H 2 and D 2 exhibits a transition from inverse to normal upon raising the temperature. The temperature dependence of the EIE for oxidative addition of CH 4 and CD 4 differs significantly from that for coordination, with the EIE being normal at all temperatures and approaching infinity at 0 K. The EIE for coordination of CH 4 and CD 4 does not exhibit typical van't Hoff type behavior in which there is a monotonic variation of EIE with temperature rather, the temperature dependence of the EIE exhibits a maximum, with inverse values (1) at high temperatures. The temperature dependence of the equilibrium isotope effects (EIEs) for coordination and oxidative addition of C−H and H−H bonds to the tungstenocene species has been determined with the aid of DFT (B3LYP) calculations.