Rate constants for addition of triethylsilyl radicals to spin traps

1984 ◽  
Vol 33 (4) ◽  
pp. 864-867
Author(s):  
R. G. Gasanov ◽  
L. V. Ivanova ◽  
R. Kh. Freidlina
Keyword(s):  
Rate Constants ◽  
Spin Traps ◽  
Rate Constants For Addition

The analysis of muonium hyperfine interaction measurements of thermal rate constants for addition reactions

1991 ◽  
Vol 94 (4) ◽  
pp. 2794-2806 ◽  
Author(s):  
Ronald J. Duchovic ◽  
Albert F. Wagner ◽  
Ralph Eric Turner ◽  
David M. Garner ◽  
Donald G. Fleming
Keyword(s):  
Hyperfine Interaction ◽  
Rate Constants ◽  
Addition Reactions ◽  
Thermal Rate Constants ◽  
Muonium Hyperfine ◽  
Rate Constants For Addition

Absolute Rate Constants for Hydrocarbon Autoxidation. XXII. The Autoxidation of some Vinyl Compounds

1972 ◽  
Vol 50 (14) ◽  
pp. 2298-2304 ◽  
Author(s):  
J. A. Howard
Keyword(s):  
Rate Constants ◽  
Addition Reaction ◽  
Peroxy Radical ◽  
Stabilization Energy ◽  
Peroxy Radicals ◽  
Absolute Rate ◽  
Termination Rate ◽  
Vinyl Compound ◽  
Rate Constants For Addition

Absolute propagation and termination rate constants have been determined for the autoxidation of some vinyl compounds at 30°. Rates of propagation depend on the structure of both the peroxy radical and the vinyl compound. The reactivity of peroxy radicals towards addition increases as the electron-withdrawing capacity of the α-substituent increases. Rate constants for addition of t-butylperoxy radicals to vinyl compounds, [Formula: see text] fit the equation[Formula: see text]where Es is the estimated stabilization energy of the β-peroxyalkyl radical (in kcal/mol) formed in the addition reaction.

Solvent, Substituent, and Temperature Effects on the Absolute Rate Constants for Addition of Methoxytrimethylsilane to 1,1-Diarylsilenes

2001 ◽  
Vol 20 (5) ◽  
pp. 932-936 ◽  
Author(s):  
William J. Leigh ◽  
Christine J. Bradaric ◽  
Tracy L. Morkin ◽  
Xiaojing Li
Keyword(s):  
Rate Constants ◽  
Temperature Effects ◽  
Absolute Rate ◽  
The Absolute ◽  
Rate Constants For Addition

ChemInform Abstract: Rate Constants for Addition of a Primary Alkyl Radical to Carbon Monoxide.

ChemInform ◽  
2010 ◽  
Vol 27 (14) ◽  
pp. no-no
Author(s):  
K. NAGAHARA ◽  
I. RYU ◽  
N. KAMBE ◽  
M. KOMATSU ◽  
N. SONODA
Keyword(s):  
Carbon Monoxide ◽  
Rate Constants ◽  
Alkyl Radical ◽  
Rate Constants For Addition

Nucleophilicity toward Ketenes:  Rate Constants for Addition of Amines to Aryl Ketenes in Acetonitrile Solution

2001 ◽  
Vol 66 (15) ◽  
pp. 5016-5021 ◽  
Author(s):  
N. C. de Lucas ◽  
J. C. Netto-Ferreira ◽  
J. Andraos ◽  
J. C. Scaiano
Keyword(s):  
Rate Constants ◽  
Acetonitrile Solution ◽  
Rate Constants For Addition

REACTIONS OF THE ETHYL RADICAL: VI. ADDITION TO CONJUGATED DIENES

1965 ◽  
Vol 43 (5) ◽  
pp. 1102-1109 ◽  
Author(s):  
A. C. R. Brown ◽  
D. G. L. James
Keyword(s):  
Rate Constants ◽  
Chain Transfer ◽  
Conjugated Dienes ◽  
Energy Of Activation ◽  
Conjugated Diene ◽  
Kcal Mole ◽  
Hydrogen Atoms ◽  
Ethyl Radical ◽  
Diene System ◽  
Rate Constants For Addition

Arrhenius parameters have been measured for the addition of the ethyl radical to the conjugated diene system in three representative molecular environments. Significant differences are found among the values of the energy of activation for addition, which are: 4.5 ± 0.2 kcal/mole for 2,3-dimethylbutadiene-1,3, 5.2 ± 0.3 kcal/mole for cyclohexadiene-1,3, and 6.6 ± 0.3 kcal/mole for 2,5-dimethylhexadiene-2,4. The increase in the energy of activation in this series is paralleled by an increase in the degree of shielding of the terminal carbon atoms of the conjugated system by substituent groups. The energy of activation for metathesis is significantly lower for cyclohexadiene-1,3 (5.4 ± 0.5 kcal/mole) than for 2,5-dimethylhexadiene-2,4 (7.6 ± 0.4 kcal/mole); the activated hydrogen atoms of the former are all secondary, whereas those of the latter are all primary. The ratio of the rate constants for addition and metathesis at 60° indicate that the radical homopolymerization of cyclohexadiene-1,3 and 2,5-dimethylhexadiene-2,4 should be subject to extensive degradative chain transfer.

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