The effect of substituents and polymer media on photochromism kinetics of indolinospironaphthoxazine

1999 ◽  
Vol 42 (4) ◽  
pp. 411-418
Author(s):  
Ping Liu ◽  
Yangfu Ming ◽  
Meigong Fan
Keyword(s):  
Effect Of Substituents ◽  
Kinetics Of

Kinetics of the reactions of the nitrate radical with a series of halogenobutenes. A study of the effect of substituents on the rate of addition of NO3to alkenes

1992 ◽  
Vol 88 (8) ◽  
pp. 1093-1099 ◽  
Author(s):  
R. William S. Aird ◽  
Carlos E. Canosa-Mas ◽  
David J. Cook ◽  
George Marston ◽  
Paul S. Monks ◽  
...  
Keyword(s):  
Nitrate Radical ◽  
Effect Of Substituents ◽  
Kinetics Of

Gas-phase pyrolysis kinetics of 2-substituted-2-propyl acetates. Effect of substituents on the .alpha.-carbon of tertiary acetates

1980 ◽  
Vol 84 (1) ◽  
pp. 9-11 ◽  
Author(s):  
Ignacio Martin ◽  
Gabriel Chuchani ◽  
Irama Avila ◽  
Alexandra Rotinov ◽  
Rolando Olmos
Keyword(s):  
Gas Phase ◽  
Pyrolysis Kinetics ◽  
Effect Of Substituents ◽  
Kinetics Of ◽  
Alpha Carbon

ChemInform Abstract: Kinetics of the Reactions of the Nitrate Radical with a Series of Halogenobutenes. A Study of the Effect of Substituents on the Rate of Addition of NO3 to Alkenes

ChemInform ◽  
2010 ◽  
Vol 23 (33) ◽  
pp. no-no
Author(s):  
R. W. S. AIRD ◽  
C. E. CANOSA-MAS ◽  
D. J. COOK ◽  
G. MARSTON ◽  
P. S. MONKS ◽  
...  
Keyword(s):  
Nitrate Radical ◽  
Effect Of Substituents ◽  
Kinetics Of

Triazene metabolism. I. The effect of substituents in the aryl group on the kinetics of enzyme-catalysed N-demethylation of 1-aryl-3,3-dimethyltriazenes

1981 ◽  
Vol 59 (12) ◽  
pp. 1234-1238 ◽  
Author(s):  
James R. P. Godin ◽  
Keith Vaughan ◽  
Kenneth W. Renton
Keyword(s):  
Liver Microsomes ◽  
The Other ◽  
Active Metabolites ◽  
Aryl Group ◽  
Effect Of Substituents ◽  
Formaldehyde Release ◽  
Other Hand ◽  
Order Of Magnitude ◽  
Nash Reagent ◽  
Kinetics Of

A series of antitumor dimethylaryltriazenes (ArN=N∙NMe2) have been studied with respect to enzyme catalysed N-demethylation by liver microsomes and the Km values determined by Lineweaver–Burk treatement. The substituent in the aryl group of the triazene does not significantly effect the magnitude of Km, which is of the same order of magnitude as the Km for aminopyrine. On the other hand, dimethyltriazenes appear to have lower Km values for demethylation than the structurally similar dimethylnitrosamines. Monomethyltriazenes, the proposed active metabolites of the dimethyltriazenes, do not undergo appreciable demethylation in the presence of microsomes and it appears that the dimethyltriazenes only demethylate once during metabolism. Spontaneous formaldehyde release from the hydroxymethyltriazene in the presence of the Nash reagent prevented an analogous study of the metabolism of these compounds.

Substituent effects in the reaction of aromatic amines and peroxydisulfate

1969 ◽  
Vol 47 (19) ◽  
pp. 3710-3713 ◽  
Author(s):  
N. Venkatasubramanian ◽  
A. Sabesan
Keyword(s):  
Nitrogen Atom ◽  
Carbon Atom ◽  
Aromatic Amines ◽  
Substituent Effects ◽  
Substituted Anilines ◽  
Electrophilic Attack ◽  
Effect Of Substituents ◽  
Hammett Constants ◽  
Kinetics Of ◽  
Electron Withdrawing Substituents

The kinetics of the reaction between aromatic amines and the peroxydisulfate ion in aqueous basic conditions have been investigated. The effect of substituents has been studied by employing about 25 ortho-, meta-, and para-substituted anilines. The reaction is accelerated by electron-releasing substituents and is retarded by electron-withdrawing substituents, pointing to an electrophilic attack by the S2O82− ion. A better correlation between rate and the Hammett constants is obtained for an electrophilic attack at the nitrogen atom of the amine rather than at the carbon atom of the amine. A good correlation also exists between the log k2 values and the pKb of the corresponding amines.

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