Carbon isotope effects in proton abstraction from 2-nitropropane-2-14C by pyridines. The contribution of tunneling

1980 ◽  
Vol 102 (14) ◽  
pp. 4780-4784 ◽  
Author(s):  
Joe C. Wilson ◽  
Inger Kaellsson ◽  
William H. Saunders
Keyword(s):  
Carbon Isotope ◽  
Isotope Effects ◽  
Proton Abstraction

Carbon isotope effects in the open-system Fischer–Tropsch synthesis

2007 ◽  
Vol 71 (18) ◽  
pp. 4474-4487 ◽  
Author(s):  
Yuri A. Taran ◽  
George A. Kliger ◽  
Vyacheslav S. Sevastianov
Keyword(s):  
Carbon Isotope ◽  
Open System ◽  
Isotope Effects ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

CARBON ISOTOPE EFFECTS IN METHANE PRODUCTION BY THERMAL CRACKING

1970 ◽  
pp. 37-53 ◽  
Author(s):  
WILLIAM M. SACKETT ◽  
SONGCHAI NAKAPARKSIN ◽  
DONALD DALRYMPLE
Keyword(s):  
Carbon Isotope ◽  
Methane Production ◽  
Isotope Effects ◽  
Thermal Cracking

The mechanism of the pinacol-pinacone rearrangement. V. Carbon isotope effects

1957 ◽  
Vol 10 (1) ◽  
pp. 7 ◽  
Author(s):  
JF Duncan ◽  
KR Lynn
Keyword(s):  
High Temperature ◽  
Transition State ◽  
Carbon Isotope ◽  
Isotope Effects ◽  
Alternative Mechanism ◽  
Alternative Route ◽  
Temperature Reaction ◽  
Exchange Reactions ◽  
Carbonium Ion ◽  
High Temperature Reaction

The intermolecular isotope effects of methyl-labelled and alcoholic carbon-labelled pinacol converted to pinacone have been studied over a temperature range of 60-113.5 �C. Tests were made to establish the validity of the results by using two starting materials for synthesizing methyl-labelled pinacol, and several different methods of analysing the products. The isotope effects were determined by measurements made both on (i) pinacol and (ii) pinacone. The results above 80 �C can be interpreted in terms of the synartetic ion mechanism provided both the carbonium ion and the transition state are largely unhydrated, and both the formation of the carbonium ion and the methyl migration are slow steps. Below 60 �C an alternative mechanism is operative. Unless unsuspected exchange reactions are present, the results suggest that the transition state is not so greatly distorted from a simple ethane-type configuration as in the high temperature reaction. Results at intermediate temperatures indicate that the alternative route proceeds via a stable intermediate.

Carbon isotope effects on enzyme-catalyzed carboxylation of ribulose bisphosphate

Biochemistry ◽  
1984 ◽  
Vol 23 (25) ◽  
pp. 6275-6284 ◽  
Author(s):  
C. A. Roeske ◽  
Marion H. O'Leary
Keyword(s):  
Carbon Isotope ◽  
Isotope Effects ◽  
Ribulose Bisphosphate
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