Carbon isotope exchange during polymetamorphism in the Panamint Mountains, California, USA

1996 ◽  
Vol 14 (2) ◽  
pp. 199-212 ◽  
Author(s):  
D. BERGFELD ◽  
P. I. NABELEK ◽  
T. C. LABOTKA
Keyword(s):  
Carbon Isotope ◽  
Isotope Exchange ◽  
Panamint Mountains

Late-Stage Carbon Isotope Exchange of Aryl Nitriles through Ni-Catalyzed C–CN Bond Activation

2021 ◽  
Vol 143 (12) ◽  
pp. 4817-4823
Author(s):  
Sean W. Reilly ◽  
Yu-hong Lam ◽  
Sumei Ren ◽  
Neil A. Strotman
Keyword(s):  
Carbon Isotope ◽  
Late Stage ◽  
Isotope Exchange ◽  
Bond Activation ◽  
Aryl Nitriles

scholarly journals Fast Carbon Isotope Exchange of Carboxylic Acids Enabled by Organic Photoredox Catalysis

2021 ◽  
Vol 143 (5) ◽  
pp. 2200-2206
Author(s):  
Duanyang Kong ◽  
Maxime Munch ◽  
Qiqige Qiqige ◽  
Christopher J. C. Cooze ◽  
Benjamin H. Rotstein ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Carboxylic Acids ◽  
Isotope Exchange ◽  
Photoredox Catalysis

scholarly journals A Photochemical Strategy for Carbon Isotope Exchange with CO2

2020 ◽  
Author(s):  
Victor Babin ◽  
Alex Talbot ◽  
Alexandre Labiche ◽  
Gianluca Destro ◽  
Antonio Del Vecchio ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Isotope Exchange ◽  
Thermal Conditions ◽  
Single Step ◽  
Structural Modifications ◽  
Mild Conditions ◽  
Stark Contrast ◽  
Acetic Acids

A novel photocatalytic approach for carbon isotope exchange is reported. Utilizing [<sup>13</sup>C]CO<sub>2</sub> as primary C1 sources, this protocol allows the insertion of the desired carbon isotope into phenyl acetic acids without the need of structural modifications or pre-functionalization, in one single step. The exceptionally mild conditions required for this traceless transformation are in stark contrast with previous methods requiring the use of harsh thermal conditions.

A Theoretical Study of the Astrochemical 13C12CS + H → 12C13CS + H Reaction

2018 ◽  
Vol 71 (4) ◽  
pp. 311
Author(s):  
Dahbia Talbi
Keyword(s):  
Ab Initio ◽  
Exchange Reaction ◽  
Carbon Isotope ◽  
Isotope Exchange ◽  
Theoretical Study ◽  
Ab Initio Study ◽  
Isotope Exchange Reaction ◽  
Interstellar Clouds

A quantitative ab initio study of the carbon isotope-exchange reaction 13C12CS + H → 12C13CS + H was performed at the RCCSD(T)/aug-cc-pVQZ//M06–2X/aug-cc-pVTZ level of theory, revealing that this reaction is barrier-less. This result validates the chemical hypothesis of Furuya et al., who suggested this reaction to be responsible for the 12C13CS/13C12CS isotopomer ratio observed to be higher than unity in cold interstellar clouds.

scholarly journals Fast Carbon Isotope Exchange of Carboxylic Acids Enabled by Organic Photoredox Catalysis

2020 ◽  
Author(s):  
Duanyang Kong ◽  
Maxime Munch ◽  
Qiqige Qiqige ◽  
Christopher Cooze ◽  
Benjamin Rotstein ◽  
...  
Keyword(s):  
Transition Metal ◽  
Carbon Isotope ◽  
Carboxylic Acids ◽  
Isotope Exchange ◽  
Room Temperature ◽  
Reaction Times ◽  
Thermally Induced ◽  
Drug Molecules ◽  
Metal Catalyzed ◽  
Isotopic Incorporation

Carbazole/cyanobenzene photocatalysts promote the direct isotopic carboxylate exchange of C(sp3 )-acids with labelled CO2. Substrates that are not compatible with transition metal catalyzed degradation-reconstruction approaches or prone to thermally induced reversible decarboxylation undergo isotopic incorporation at room temperature in short reaction times. The radiolabelling of drug molecules and precursors with [11C]CO2 is demonstrated.

scholarly journals A Photochemical Strategy for Carbon Isotope Exchange with CO2

2020 ◽  
Author(s):  
Victor Babin ◽  
Alex Talbot ◽  
Alexandre Labiche ◽  
Gianluca Destro ◽  
Antonio Del Vecchio ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Isotope Exchange ◽  
Thermal Conditions ◽  
Single Step ◽  
Structural Modifications ◽  
Mild Conditions ◽  
Stark Contrast ◽  
Acetic Acids

A novel photocatalytic approach for carbon isotope exchange is reported. Utilizing [<sup>13</sup>C]CO<sub>2</sub> as primary C1 sources, this protocol allows the insertion of the desired carbon isotope into phenyl acetic acids without the need of structural modifications or pre-functionalization, in one single step. The exceptionally mild conditions required for this traceless transformation are in stark contrast with previous methods requiring the use of harsh thermal conditions.

scholarly journals Transition‐Metal‐Free Carbon Isotope Exchange of Phenyl Acetic Acids

2020 ◽  
Vol 132 (32) ◽  
pp. 13592-13597
Author(s):  
Gianluca Destro ◽  
Kaisa Horkka ◽  
Olivier Loreau ◽  
David‐Alexandre Buisson ◽  
Lee Kingston ◽  
...  
Keyword(s):  
Transition Metal ◽  
Carbon Isotope ◽  
Isotope Exchange ◽  
Free Carbon ◽  
Metal Free ◽  
Acetic Acids
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