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We note that both rate constants reflect the saturation coverage of either butoxides in 1-butene double bond isomerization or adsorbed butanol monomers in 2-butanol dehydration and allow rigorous conclusions with respect to the kinetic relevance of the butoxide desorption and the elimination step
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We note that both rate constants reflect the saturation coverage of either butoxides in 1-butene double bond isomerization or adsorbed butanol monomers in 2-butanol dehydration and allow rigorous conclusions with respect to the kinetic relevance of the butoxide desorption and the elimination step.
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13
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48749127114
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The high pre-exponential factor of the elimination step leads to rate constants for the elimination and butene desorption steps that differ less than expected from the calculated barriers (see also section 3.2).
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The high pre-exponential factor of the elimination step leads to rate constants for the elimination and butene desorption steps that differ less than expected from the calculated barriers (see also section 3.2).
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14
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4 by DFT, corresponding to zero point energy differences ΔZPE(D)-ZPE(H) of about 8.3 kJ/mol, leading to a KIE of 18.8.
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4 by DFT, corresponding to zero point energy differences ΔZPE(D)-ZPE(H) of about 8.3 kJ/mol, leading to a KIE of 18.8.
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16
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0014777656
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the high isotope effects which result from deuteration in α-position imply a rate-determining participation of the Cα-H(D) bond fission during the dehydration course
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48749113234
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2O (ion-dipole) interaction.
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2O (ion-dipole) interaction.
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The transition state of alkene desorption on POM clusters has been shown to be concerted and to involve both a weak interaction of Cα (which carries the positive charge) with a terminal oxygen of the POM cluster and the interaction of a β-H with the bridging oxygen of the POM cluster. Abstraction of the β-H and formation of the alkene double bond will lead to the formation of the 1-alkene species. Campbell, K. A, Janik, M. J, Neurock, M, Davis, R. J. Langmuir 2004, 21, 4738
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α (which carries the positive charge) with a terminal oxygen of the POM cluster and the interaction of a β-H with the bridging oxygen of the POM cluster. Abstraction of the β-H and formation of the alkene double bond will lead to the formation of the 1-alkene species. Campbell, K. A.; Janik, M. J.; Neurock, M.; Davis, R. J. Langmuir 2004, 21, 4738.
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POM hydrogen bonds between the cationic dimer and the anionic conjugate base [ref 10].
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POM hydrogen bonds between the cationic dimer and the anionic conjugate base [ref 10].
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+)).
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+)).
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