Carbon−14 Isotope Effect in the Exchange Reaction between Carbon Monoxide and Phosgene

1953 ◽  
Vol 21 (12) ◽  
pp. 2232-2232
Author(s):  
D. R. Stranks
Keyword(s):  
Carbon Monoxide ◽  
Exchange Reaction ◽  
Isotope Effect ◽  
Carbon 14

scholarly journals Does Size Really Matter? The Steric Isotope Effect in a Supramolecular Host-Guest Exchange Reaction

2010 ◽  
Vol 122 (21) ◽  
pp. 3717-3719 ◽  
Author(s):  
Jeffrey S. Mugridge ◽  
Robert G. Bergman ◽  
Kenneth N. Raymond
Keyword(s):  
Exchange Reaction ◽  
Isotope Effect

FREE RADICAL RECOMBINATION IN THE PHOTOLYSIS OF ACETONE

1955 ◽  
Vol 33 (5) ◽  
pp. 750-754 ◽  
Author(s):  
S. N. Naldrett
Keyword(s):  
Carbon Monoxide ◽  
Free Radical ◽  
Quantum Efficiency ◽  
Room Temperature ◽  
Methyl Groups ◽  
Carbon 14 ◽  
Radical Recombination

(CH3CO)2-1-C14 (I) was prepared by irradiating (CH3)2CO in the presence of CH3I-C14. Acetone was then irradiated at room temperature with light of 2537 Å in the presence of (I). Radioactivity was found in all products which contained methyl groups but not in any carbon monoxide product. The amount of carbon-14 ultimately found in acetone confirms that the quantum efficiency of the primary photolytic process is nearly unity and that extensive recombination of methyl and acetyl radicals to form acetone is responsible for the low over-all quantum efficiency of decomposition.

scholarly journals Does Size Really Matter? The Steric Isotope Effect in a Supramolecular Host-Guest Exchange Reaction

2010 ◽  
Vol 49 (21) ◽  
pp. 3635-3637 ◽  
Author(s):  
Jeffrey S. Mugridge ◽  
Robert G. Bergman ◽  
Kenneth N. Raymond
Keyword(s):  
Exchange Reaction ◽  
Isotope Effect

Unequal primary kinetic isotope effects in the base-catalysed H–D exchange of diastereotopic protons

1980 ◽  
Vol 58 (1) ◽  
pp. 72-78 ◽  
Author(s):  
Robert R. Fraser ◽  
Philippe J. Champagne
Keyword(s):  
Transition State ◽  
Exchange Reaction ◽  
Isotope Effect ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Deuterium Isotope Effect ◽  
Kinetic Isotope

Primary kinetic isotope effects have been measured for the base-catalyzed exchange reaction of 4′,1″-dimethyl-1,2,3,4-dibenzcyclohepta-1,3-diene-6-one, 1. It was found that the isotope effects kH/kT and kD/kT for the faster exchanging protons (13.6 and 3.8 respectively) are significantly larger than the corresponding values for the slower exchanging protons (4.6 and 1.6 respectively). These differences could result from truly unequal isotope effects due to transition state differences or intrusion of a second pathway for exchange of the less reactive proton in the dedeuteration reaction. The data appear to support the latter interpretation. The secondary deuterium isotope effect was found to be 1.18.

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