scholarly journals The Mechanism of the Reaction of (Arylthio)trimethylgermanes with Benzyl Bromides Giving Aryl Benzyl Sulfides. A Kinetic Study

1987 ◽  
Vol 60 (11) ◽  
pp. 4061-4065 ◽  
Author(s):  
Seizi Kozuka ◽  
Shoji Tamura ◽  
Satoshi Ishibashi ◽  
Sadamu Ohya ◽  
Waichiro Tagaki
Keyword(s):  
Kinetic Study ◽  
Mechanism Of The Reaction

A kinetic study of nickel(II)–murexide complex formation in dimethylsulfoxide/nitromethane mixed solvents

1976 ◽  
Vol 54 (5) ◽  
pp. 706-710 ◽  
Author(s):  
James P. K. Tong ◽  
Cooper H. Langford
Keyword(s):  
Complex Formation ◽  
Kinetic Study ◽  
Mixed Solvents ◽  
Solvent Composition ◽  
Nmr Data ◽  
Inert Solvent ◽  
Coordinate Sphere ◽  
Mechanism Of The Reaction

The rates of nickel(II)–murexide complex formation were studied in dimethylsulfoxide/nitromethane mixed solvents at 25 °C with the latter being an "inert" solvent, to elucidate the mechanism of the reaction. Results do not fit in detail with a D mechanism and the five-coordinated intermediate interpretation. Id mechanisms are able to explain the observations with and without invoking a nitromethane-containing intermediate, Ni(DMSO)5NM2+. Both mechanisms were tested with the aid of nmr data on solvation (second coordinate sphere nitromethane population). Ligand solvation unavoidably plays a major role in the determination of the encounter as well as the complex formation equilibrium. The simplest mechanism assumes an Id process in which the probability of encounter between Ni(DMSO)62+ and murexide ion is quite sensitive to solvent composition.

scholarly journals Kinetic Study of Aluminum Sulphate and Ammonium Aluminum Sulphate Coagulants in Wastewater Treatment

2007 ◽  
Vol 3 (3) ◽  
pp. 222-228
Author(s):  
Lugard Ukiwe ◽  
C.I.A. Nwoko ◽  
Okere-Chijioke M
Keyword(s):  
Wastewater Treatment ◽  
Kinetic Study ◽  
Kinetic Parameters ◽  
Rate Constant ◽  
General Trend ◽  
First Order ◽  
Coagulation Performance ◽  
Aluminum Sulphate ◽  
Kinetics Of ◽  
Mechanism Of The Reaction

An investigation into the kinetics of two inorganic coagulant namely: aluminum sulphate octadecahydrate (Al2(SO4)3.18H2O) an ammonium aluminum sulphate dodecahydrate (NH4Al(SO4)2.12H2O) was studied to determine the effect of certain kinetic parameters on coagulation performance of the above mentioned coagulants. Results of analysis obtained revealed that the rate constant (k) for Al2(SO4)3.18H2O was 5.727s-1, while that for NH4Al(SO4)2.12H2O was 2.282s-1. However, the order of the reaction (xn) of Al2(SO4)3.18H2O and NH4Al(SO4)2.12H2O with the wastewater was 1.0 and 1.0, respectively, indicating that both reactions were first order. Considering the mechanism of the reaction, the general trend observed indicated that the Al2(SO4)3.18H2O reaction was thrice as fast as the NH4Al(SO4)2.12H2O reaction. This fact together with the larger value of k for Al2(SO4)3.18H2O obtained in the experiment lend credence to the widely held believe that Al2(SO4)3.18H2O is a more effective coagulant than NH4Al(SO4)2.12H2O in wastewater treatment.

THE CHEMISTRY OF YLIDS: XV. MECHANISM OF THE REACTION OF IMINOPHOSPHORANES WITH CARBONYL COMPOUNDS

1966 ◽  
Vol 44 (23) ◽  
pp. 2793-2803 ◽  
Author(s):  
A. William Johnson ◽  
Simon C. K. Wong
Keyword(s):  
Nitrogen Atom ◽  
Kinetic Study ◽  
Phosphorus Atom ◽  
Carbonyl Compounds ◽  
Delicate Balance ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Rate Limiting ◽  
Mechanism Of The Reaction

The pKa values of two series of iminophosphoranes, N-(substituted phenyl)-iminotriphenylphosphoranes (VI) and N-phenyliminotri-(substituted phenyl)-phosphoranes (VII), have been correlated with σ0 and σ, respectively, giving ρ values of +3.5 and +9.3. A kinetic study of the reaction of VI and VII with benzaldehydes indicates that a betaine intermediate (V) is involved. The rate-limiting step of the reaction changes, the result of a delicate balance between the nucleophilicity of the nitrogen atom and the electrophilicity of the phosphorus atom. The involvement of dπ–pπ bonding is indicated.

Detailed Mechanism of the Reaction of Phenylboronic Acid Derivatives with D-Fructose in Aqueous Solution: A Comprehensive Kinetic Study

2016 ◽  
Vol 1 (16) ◽  
pp. 5141-5151 ◽  
Author(s):  
Yota Suzuki ◽  
Mika Shimizu ◽  
Takuya Okamoto ◽  
Tomoaki Sugaya ◽  
Satoshi Iwatsuki ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Kinetic Study ◽  
Phenylboronic Acid ◽  
Detailed Mechanism ◽  
Mechanism Of The Reaction

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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