scholarly journals Properties of Feshbach and “shape”-resonances in ozone and their role in recombination reactions and anomalous isotope effects

2018 ◽  
Vol 212 ◽  
pp. 259-280 ◽  
Author(s):  
Alexander Teplukhin ◽  
Dmitri Babikov
Keyword(s):  
Isotope Effects ◽  
Reaction Pathways ◽  
Recombination Reactions ◽  
Shape Resonances

Three reaction pathways for formation of symmetric and asymmetric isotopologues of ozone.

scholarly journals Primary and secondary H/D isotope effects in the addition of triazolinedione to 2,5-dimethyl-2,4-hexadiene. Mechanistic insights into the reaction pathways

ARKIVOC ◽  
2003 ◽  
Vol 2002 (13) ◽  
pp. 9-16
Author(s):  
Georgios Vassilikogiannakis ◽  
Manolis Stratakis ◽  
Michael Orfanopoulos
Keyword(s):  
Isotope Effects ◽  
Reaction Pathways

scholarly journals Solvent-mediated Isotope Effects Strongly Influence the Early Stages of Calcium Carbonate Formation: Exploring D2O vs. H2O in a Combined Computational and Experimental Approach

2021 ◽  
Author(s):  
Michael King ◽  
Jonathan Thomas Avaro ◽  
Christine Peter ◽  
Karin Hauser ◽  
Denis Gebauer
Keyword(s):  
Calcium Carbonate ◽  
Heavy Water ◽  
Experimental Approach ◽  
Isotope Effects ◽  
Experimental Studies ◽  
Reaction Pathways ◽  
Solvent Exchange ◽  
Early Stages ◽  
Carbonate Formation

In experimental studies, heavy water (D2O) is employed, e.g., so as to shift the spectroscopic solvent background, but any potential effects of this solvent exchange on reaction pathways are often...

Isotope effect studies on elimination reactions. VI. The mechanism of the bimolecular elimination reaction of 2-arylethylammonium ions

1970 ◽  
Vol 48 (1) ◽  
pp. 125-132 ◽  
Author(s):  
P. J. Smith ◽  
A. N. Bourns
Keyword(s):  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Isotope Effects ◽  
Nitrogen Isotope ◽  
Reaction Pathways ◽  
Elimination Reaction ◽  
Tracer Studies ◽  
Kinetic Isotope ◽  
Probable Reaction ◽  
Zwitterionic Intermediate

The mechanism of the elimination reaction of 2-arylethyltrimethylammonium ions with ethoxide ion in ethanol has been examined using tracer and kinetic isotope effect techniques. Absence of exchange with solvent of both 2-phenylethyltrimethylammonium-2,2-d2 bromide and 2-(p-trifluoromethylphenyl)-ethyltrimethylammonium-2,2-d2 bromide and the observation of nitrogen isotope effects of 1.3 and 0.9%, respectively, have eliminated a two-step process involving a freely-solvated carbanion intermediate for both salts. The observation of only a slight change in the magnitude of the nitrogen isotope effect when the solvent is changed from ethanol to water has also excluded a zwitterionic intermediate which is specifically hydrogen-bonded to the molecule of ethanol formed by removal of a β-hydrogen by ethoxide ion. Finally, tracer studies using α- and β-dideuterated substrates have eliminated the less probable reaction pathways involving ylide and carbene intermediates. It is concluded that the reaction of 2-arylethyltrimethylammonium salts with ethoxide ion is a concerted E2 process.

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