ChemInform Abstract: A Kinetic Study of the Migration of a Phenyl Group from Sulfur to a Carbon Radical Center: Rearrangement of the α-(Phenylthio)benzyl Radical.

ChemInform ◽  
2010 ◽  
Vol 23 (23) ◽  
pp. no-no
Author(s):  
M. S. ALNAJJAR ◽  
J. A. FRANZ
Keyword(s):  
Kinetic Study ◽  
Phenyl Group ◽  
Radical Center ◽  
Benzyl Radical

Mechanistic insights into the Ag(I)-catalyzed aryl migration

2017 ◽  
Vol 95 (5) ◽  
pp. 620-626 ◽  
Author(s):  
Xiang Zhang
Keyword(s):  
Density Functional ◽  
Phenyl Group ◽  
Radical Intermediate ◽  
Functional Theory ◽  
Elementary Reactions ◽  
Benzyl Radical ◽  
Benzyl Cation ◽  
Nitrogen Center ◽  
The Difference ◽  
Nitrogen Radical

Theoretical investigation has been conducted into the mechanism for the Ag(I)/PhI(OTFA)2-catalyzed 1,4-radical aryl migration from carbon center to nitrogen center in sulfonamides by using density functional theory (DFT). The calculations show that 11 elementary reactions compose the whole catalytic reaction, which includes the deprotonation, the oxidation of Ag(I) intermediate to Ag(II) intermediate, the formation of nitrogen radical, the 1,4-radical aryl migration, the oxidation of benzyl radical to benzyl cation, etc. The difference between sulfonamides and other amides in the deprotonation process accounts for the experimental phenomenon that only the sulfonamides perform the deprotonation and subsequent 1,4-radical aryl migrations. Moreover, migrations of this kind proceed via a five-membered spirocyclic radical intermediate and favor the electron-rich phenyl group.

A kinetic study of controlling nitrogen in process for boron steel by using30N2isotope gas

2008 ◽  
Vol 105 (12) ◽  
pp. 601-608
Author(s):  
Seung Min Han ◽  
Dong Joon Min ◽  
Joo Hyun Park ◽  
Jung Ho Park ◽  
Jong Min Park
Keyword(s):  
Kinetic Study ◽  
Boron Steel

Kinetic Study of the Effect of Heparin on the Amidase Activity of Trypsin, Plasmin and Urokinase

1983 ◽  
Vol 49 (03) ◽  
pp. 199-203 ◽  
Author(s):  
V M Yomtova ◽  
N A Stambolieva ◽  
B M Blagoev
Keyword(s):  
Kinetic Study ◽  
Active Center ◽  
Simultaneous Presence ◽  
Amidase Activity ◽  
Competitive Inhibitors ◽  
Uncompetitive Inhibitor

SummaryIt was found that the effect of heparin on the amidase activity of urokinase (E C 3.4.21.31), plasmin (E C 3.4.21.7) and trypsin (E C 3.4.21.4) depended on the substrate used. No effect of heparin on the amidase activity of urokinase and trypsin was observed when Pyro Glu-Gly-Arg-p-nitroanilide (S-2444) and α-N-acetyl-L-lysine-p-nitroanilide (ALNA) were used as substrates. Heparin acted as a uncompetitive inhibitor of trypsin (Ki = 1.2×10-6 M), plasmin (Ki = 4.9×10-6 M) and urokinase (Ki = l.0×10-7 M) when Bz-Phe-Val-Arg-p-nitroanilide (S-2160), H-D-Val-Leu-Lys-p-nitroanilide (S-2251) and plasminogen, respectively, were used as substrates. These results, as well as the data obtained by studying the effect of the simultaneous presence of heparin and competitive inhibitors suggest that although heparin is not bound at the active center of these enzymes, it may influence the effectivity of catalysis.

A kinetic study of the metathesis of propene on a rhenium-aluminium catalyst

1981 ◽  
Vol 31 (1) ◽  
pp. 388-394 ◽  
Author(s):  
Mahmoud El-Sawi ◽  
Antonio Iannibello ◽  
Fernando Morelli ◽  
Ganfranco Gatalano ◽  
Francesco Intrieri ◽  
...  
Keyword(s):  
Kinetic Study
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