Variational transition state theory as a tool to determine kinetic selectivity in reactions involving a valley-ridge inflection point |
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Authors: | Ganzález-Lafont Angels Moreno Miquel Lluch José M |
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Affiliation: | Contribution from the Departament de Química, Universitat Autonoma de Barcelona, 08193 Bellaterra (Barcelona), Spain. |
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Abstract: | Variational transition state theory has been used to calculate the kinetic isotope effects affecting product ratios in the reaction between (1)O(2) and d(6)-tetramethylethylene. The minimum energy path on the potential energy surface for this process reaches a valley-ridge inflection point and then bifurcates leading to the two final products. Using canonical variational transition state theory, two distinct dynamical bottlenecks were located corresponding to the H- and the D-abstraction, respectively. The calculated KIE at 263 K turns out to be 1.126. Analogously, a H/T KIE of 1.17 at the same temperature has been found for the reaction of (1)O(2) with the tritiated derivative of tetramethylethylene. |
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