Analysis of the isotope effect in the hydrogen exchange reaction between pyridinium chloride and hydrogen chloride

1979 ◽  
Vol 83 (16) ◽  
pp. 2122-2125 ◽  
Author(s):  
J. Szydlowski ◽  
M. Zielinski
Keyword(s):  
Exchange Reaction ◽  
Hydrogen Chloride ◽  
Isotope Effect ◽  
Hydrogen Exchange ◽  
Pyridinium Chloride

γ-RADIATION-INDUCED HYDROGEN EXCHANGE REACTION IN LIQUID CYCLOHEXANE – HYDROGEN CHLORIDE SOLUTIONS

1966 ◽  
Vol 44 (22) ◽  
pp. 2645-2649 ◽  
Author(s):  
J. W. Fletcher ◽  
G. R. Freeman
Keyword(s):  
Exchange Reaction ◽  
Hydrogen Chloride ◽  
Hydrogen Exchange ◽  
Spectroscopic Method ◽  
Exchange Reactions ◽  
Radical Chain ◽  
Chloride System ◽  
Γ Radiation ◽  
Radiation Induced ◽  
A Chain

The overall exchange reactions[Formula: see text]have been initiated by radiolysis and measured by a nuclear magnetic resonance spectroscopic method. The reactions occur by a chain mechanism, with a chain length of ~ 104 in a 1 M solution of hydrogen chloride in cyclohexane. The mechanism is complex.The exchange reaction can also be initiated by the photolysis of chlorine or of hydrogen chloride.A chain exchange reaction does not occur between c-C6H12 and DI, D2S, or ND3. These results are consistent with the suggestion that the exchange reaction in the cyclohexane – hydrogen chloride system occurs by a free radical chain mechanism.This type of exchange reaction can cause difficulties in isotopic tracer studies.

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
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