Isotope effect on the location of variational transition states: The hydrogen exchange reaction

1986 ◽  
Vol 18 (9) ◽  
pp. 1079-1086
Author(s):  
Luis Bañares Morcillo ◽  
Angel Gonzalez Ureña ◽  
Michael Menzinger
Keyword(s):  
Exchange Reaction ◽  
Isotope Effect ◽  
Hydrogen Exchange ◽  
Transition States

Hydrogen exchange and isomerization in ortho substituted benzamides. On the question of free rotation in an N-protonated amide

1979 ◽  
Vol 57 (22) ◽  
pp. 2896-2901 ◽  
Author(s):  
Robert A. McClelland ◽  
William F. Reynolds
Keyword(s):  
Exchange Reaction ◽  
Rate Constants ◽  
Hydrogen Exchange ◽  
Isomerization Reaction ◽  
Free Rotation ◽  
Bond Rotation ◽  
Diffusion Limited ◽  
Deprotonation Reaction ◽  
Substituted Benzamides ◽  
Acid Catalyzed

Rate constants have been obtained for the acid-catalyzed N–H exchange of N-methyl, 2,N-dimethyl, and 2,4,6,N-tetramethylbenzamide and the acid-catalyzed isomerization of the three corresponding N,N-dimethylbenzamides. The ratio [Formula: see text] increases significantly with increased number of ortho methyl substituents. This is explained in terms of a suggestion of Perrin, that C—N bond rotation is not completely free in the N-protonated amide, since it must compete with a diffusion limited deprotonation reaction. The isomerization reaction, which requires such a rotation, is therefore slowed by ortho methyl substituents which hinder rotation, relative to the exchange reaction, which does not require rotation.

Hot-atom mechanism in hydrogen exchange reaction on the Ir{100} surface

2000 ◽  
Vol 323 (5-6) ◽  
pp. 586-593 ◽  
Author(s):  
Michio Okada ◽  
Kousuke Moritani ◽  
Mamiko Nakamura ◽  
Toshio Kasai ◽  
Yoshitada Murata
Keyword(s):  
Exchange Reaction ◽  
Hydrogen Exchange

A Topological Study of the Transition States of the Hydrogen Exchange and Dehydrogenation Reactions of Methane on a Zeolite Cluster

2001 ◽  
Vol 105 (29) ◽  
pp. 7079-7084 ◽  
Author(s):  
N. B. Okulik ◽  
R. Pis Diez ◽  
A. H. Jubert ◽  
P. M. Esteves ◽  
C. J. A. Mota
Keyword(s):  
Hydrogen Exchange ◽  
Transition States ◽  
Dehydrogenation Reactions
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