Secondary deuterium kinetic isotope effects on the thermolysis of 1-pyrazolines

1968 ◽  
Vol 46 (21) ◽  
pp. 3301-3304 ◽  
Author(s):  
Basil H. Al-Sader ◽  
Robert J. Crawford
Keyword(s):  
Gas Phase ◽  
Rate Constants ◽  
Relative Rate ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Kinetic Isotope ◽  
Relative Rate Constants

Secondary kinetic isotope effects on four deuterated 1-pyrazolines support the formation of a trimethylene intermediate during gas phase thermolysis. Calculation of cyclization relative rate constants for the trimethylene intermediates reveals that substitution of hydrogen by deuterium has no effect when the terminal methylenes are substituted, but the rate constants are decreased when the central methylene's hydrogens are substituted. Explanations are advanced for all of the observed effects.

Arrhenius-Parameter und kinetischer Isotopeneffekt für die Reaktion von Wasserstoffatomen mit Silan

1974 ◽  
Vol 29 (3) ◽  
pp. 493-496 ◽  
Author(s):  
Peter Potzinger ◽  
Louis C. Glasgow ◽  
Bruno Reimann
Keyword(s):  
Kinetic Isotope Effect ◽  
Relative Rate ◽  
Isotope Effects ◽  
Preexponential Factor ◽  
Kinetic Isotope Effects ◽  
Hydrogen Atoms ◽  
Kinetic Isotope ◽  
Abstraction Reaction ◽  
Upper Limits ◽  
Relative Rate Constants

The Reaction of Hydrogen Atoms with Silane; Arrhenius Parameters and Kinetic Isotope Effect Relative rate constants were measured for the systems H + C2H4/SiD4 and D + C2D4/SiH4 over a wide temperature range. From the known arrheniusparameter for the reaction H + C2H4 the activation energy EA and the preexponential factor A of the abstraction reactionH + SiD4 → HD + SiD3may be calculated. Values of EA = 3.2 kcal/Mol and A = 4.92 • 1013 cm3 Mol-1 sec-1 were obtained. Upper limits for the kinetic isotope effects are given in the paper

Muonium Addition Reactions and Kinetic Isotope Effects in the Gas Phase: k∞ Rate Constants for Mu + C2H2

2015 ◽  
Vol 119 (28) ◽  
pp. 7247-7256 ◽  
Author(s):  
Donald J. Arseneau ◽  
David M. Garner ◽  
Ivan D. Reid ◽  
Donald G. Fleming
Keyword(s):  
Gas Phase ◽  
Rate Constants ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Addition Reactions ◽  
Kinetic Isotope

A Theoretical Analysis of Rate Constants and Kinetic Isotope Effects Corresponding to Different Reactant Valleys in Lactate Dehydrogenase

2006 ◽  
Vol 128 (51) ◽  
pp. 16851-16863 ◽  
Author(s):  
Silvia Ferrer ◽  
Iñaki Tuñón ◽  
Sergio Martí ◽  
Vicente Moliner ◽  
Mireia Garcia-Viloca ◽  
...  
Keyword(s):  
Lactate Dehydrogenase ◽  
Theoretical Analysis ◽  
Rate Constants ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Kinetic Isotope

Rate constants and kinetic isotope effects for Cl+CH4→ClH+CH3: a comparison between LSC-IVR and statistical theories

2002 ◽  
Vol 360 (1-2) ◽  
pp. 59-64 ◽  
Author(s):  
Emilio Martı́nez-Núñez ◽  
Antonio Fernández-Ramos ◽  
Saulo A Vázquez ◽  
Miguel A Rı́os
Keyword(s):  
Rate Constants ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Kinetic Isotope

Dynamics calculations for the Cl+C2H6 abstraction reaction: Thermal rate constants and kinetic isotope effects

2003 ◽  
Vol 118 (14) ◽  
pp. 6280-6288 ◽  
Author(s):  
A. Fernández-Ramos ◽  
E. Martı́nez-Núñez ◽  
J. M. C. Marques ◽  
S. A. Vázquez
Keyword(s):  
Rate Constants ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Kinetic Isotope ◽  
Thermal Rate Constants ◽  
Abstraction Reaction
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