A New Form of Kinetic Isotope Effect. Dynamic Effects on Isotopic Selectivity and Regioselectivity

2003 ◽  
Vol 125 (5) ◽  
pp. 1176-1177 ◽  
Author(s):  
Daniel A. Singleton ◽  
Chao Hang ◽  
Michael J. Szymanski ◽  
Erin E. Greenwald
Keyword(s):  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Dynamic Effects ◽  
Kinetic Isotope ◽  
New Form ◽  
Isotopic Selectivity

Mechanistic Implication of the pH Effect and H/D Kinetic Isotope Effect on HCOOH/HCOO– Oxidation at Pt Electrodes: A Study by Computer Simulation

ACS Catalysis ◽  
2021 ◽  
pp. 6920-6930
Author(s):  
Meng-Ke Zhang ◽  
Wei Chen ◽  
Zhen Wei ◽  
Mian-Le Xu ◽  
ZhengDa He ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Ph Effect ◽  
Kinetic Isotope ◽  
Pt Electrodes

Quantum electrocatalysts: theoretical picture, electrochemical kinetic isotope effect analysis, and conjecture to understand microscopic mechanisms

2020 ◽  
Vol 22 (20) ◽  
pp. 11219-11243 ◽  
Author(s):  
Ken Sakaushi
Keyword(s):  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Effect Analysis ◽  
Kinetic Isotope

The fundamental aspects of quantum electrocatalysts are discussed together with the newly developed electrochemical kinetic isotope effect (EC-KIE) approach.

scholarly journals l-mandelate dehydrogenase from Rhodotorula graminis: comparisons with the l-lactate dehydrogenase (flavocytochrome b2) from Saccharomyces cerevisiae

1993 ◽  
Vol 290 (1) ◽  
pp. 103-107 ◽  
Author(s):  
O Smékal ◽  
M Yasin ◽  
C A Fewson ◽  
G A Reid ◽  
S K Chapman
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Lactate Dehydrogenase ◽  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Dimensional Structure ◽  
Striking Difference ◽  
Kinetic Properties ◽  
Proton Abstraction ◽  
Rate Determining Step ◽  
Kinetic Isotope

L-Lactate dehydrogenase (L-LDH) from Saccharomyces cerevisiae and L-mandelate dehydrogenase (L-MDH) from Rhodotorula graminis are both flavocytochromes b2. The kinetic properties of these enzymes have been compared using steady-state kinetic methods. The most striking difference between the two enzymes is found by comparing their substrate specificities. L-LDH and L-MDH have mutually exclusive primary substrates, i.e. the substrate for one enzyme is a potent competitive inhibitor for the other. Molecular-modelling studies on the known three-dimensional structure of S. cerevisiae L-LDH suggest that this enzyme is unable to catalyse the oxidation of L-mandelate because productive binding is impeded by steric interference, particularly between the side chain of Leu-230 and the phenyl ring of mandelate. Another major difference between L-LDH and L-MDH lies in the rate-determining step. For S. cerevisiae L-LDH, the major rate-determining step is proton abstraction at C-2 of lactate, as previously shown by the 2H kinetic-isotope effect. However, in R. graminis L-MDH the kinetic-isotope effect seen with DL-[2-2H]mandelate is only 1.1 +/- 0.1, clearly showing that proton abstraction at C-2 of mandelate is not rate-limiting. The fact that the rate-determining step is different indicates that the transition states in each of these enzymes must also be different.

Kinetic isotope effect in hydrolysis of bisdiazoketones

1984 ◽  
Vol 33 (5) ◽  
pp. 1095-1096
Author(s):  
L. I. Kirkovskii ◽  
A. M. Sipyagin ◽  
V. G. Kartsev
Keyword(s):  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Kinetic Isotope ◽  
Hydrolysis Of

Oxidation of 4a,4b‐Dihydrophenanthrene. IV. Kinetic Isotope Effect of Deuterium in the Propagation and the Initiation Steps

1970 ◽  
Vol 52 (11) ◽  
pp. 5952-5959 ◽  
Author(s):  
A. Bromberg ◽  
K. A. Muszkat ◽  
A. Warshel
Keyword(s):  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Kinetic Isotope

Isotope effect profiles in the N-demethylation of N,N-dimethylanilines: a key to determine the pKa of nonheme Fe(iii)–OH complexes

2015 ◽  
Vol 51 (24) ◽  
pp. 5032-5035 ◽  
Author(s):  
Alessia Barbieri ◽  
Martina De Gennaro ◽  
Stefano Di Stefano ◽  
Osvaldo Lanzalunga ◽  
Andrea Lapi ◽  
...  
Keyword(s):  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Kinetic Isotope

pKa of [(N4Py)FeIII–OH]2+ is obtained from the kinetic isotope effect profiles in the N-demethylation of N,N-dimethylanilines promoted by [(N4Py)FeIVO]2+.

Kinetic isotope effect for the reaction of H atoms with GeH4 and GeD4

1997 ◽  
Vol 29 (4) ◽  
pp. 237-243 ◽  
Author(s):  
Neville L. Arthur ◽  
Ian A. Cooper ◽  
Luke A. Miles
Keyword(s):  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Kinetic Isotope
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