Nikiforidis I, Görling A, Hieringer W (2011)
Publication Type: Journal article, Original article
Publication year: 2011
Original Authors: Nikiforidis I., Görling A., Hieringer W.
Publisher: Elsevier
Book Volume: 341
Pages Range: 63-70
DOI: 10.1016/j.molcata.2011.03.025
The nickel complex catalyzed 1-butene dimerization to yield linear and branched C olefins, a process of considerable industrial importance, is investigated with density-functional theory. Reaction energies and transition barriers have been calculated for the catalytic cycle of a nickel catalyst bearing two phosphine ligands. The data suggest olefin insertion as the rate determining step, and a hydrogen-transfer mechanism has been found as the most favorable chain termination step, in agreement with earlier studies on related systems. The olefin insertion step has subsequently been investigated in terms of its regioselectivity for three different ligands, i.e., the PH , PMe and the N-heterocyclic carbene ligand IMe. The activation barriers for the IMe ligands are mostly found to be lower than those for phosphine ligands, indicating a higher catalytic activity of carbene complexes in butene dimerization. The computed relative transition state energies suggest that the PMe and IMe ligands kinetically favor butene insertion into the primary Ni-butyl bonds, which leads to linear and singly branched C products. Energetic differences in π-complexes may under non-equilibrium conditions lead to changes in selectivity towards branched product olefins when the catalyst bears IMe ligands. © 2011 Elsevier B.V. All rights reserved.
APA:
Nikiforidis, I., Görling, A., & Hieringer, W. (2011). On the regioselectivity of the insertion step in nickel complex catalyzed dimerization of butene: A density-functional study. Journal of Molecular Catalysis A-Chemical, 341, 63-70. https://dx.doi.org/10.1016/j.molcata.2011.03.025
MLA:
Nikiforidis, Ioannis, Andreas Görling, and Wolfgang Hieringer. "On the regioselectivity of the insertion step in nickel complex catalyzed dimerization of butene: A density-functional study." Journal of Molecular Catalysis A-Chemical 341 (2011): 63-70.
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