Hydrogen abstraction by perfluoroethyl radicals from methylfluorosilanes

1976 ◽  
Vol 54 (15) ◽  
pp. 2359-2364 ◽  
Author(s):  
Thomas N. Bell ◽  
Toshitsugu Yokota ◽  
Alden G. Sherwood
Keyword(s):  
Hydrogen Abstraction ◽  
Arrhenius Parameters

Arrhenius parameters have been measured for hydrogen abstraction by C2F5 radicals (produced from the photolysis of perfluoropropionic anhydride) from methylfluorosilanes and tetramethylsilane.[Formula: see text]The results are discussed in relation to those of similar reactions involving the CF3 and the CH3 radical, and interpreted in terms of polar effects.

Kinetics of radical exchange in the reaction of CF3 radicals with tin tetramethyl

1976 ◽  
Vol 54 (10) ◽  
pp. 1617-1623 ◽  
Author(s):  
T. N. Bell ◽  
P. J. Young
Keyword(s):  
Exchange Reaction ◽  
Rate Constant ◽  
Additional Data ◽  
Hydrogen Abstraction ◽  
Arrhenius Parameters ◽  
Abstraction Reaction ◽  
Reaction Proceeds ◽  
Kinetics Of

The reaction of CF3 radicals with SnMe4 leads to hydrogen abstraction and also radical exchange.[Formula: see text]We propose the exchange reaction proceeds via a five coordinate intermediate. The Arrhenius parameters for the exchange reaction are,[Formula: see text]Additional data for the H abstraction reaction[Formula: see text]combined with previous data yields an improved rate constant for abstraction,[Formula: see text]

SOME HYDROGEN ABSTRACTION REACTIONS OF PERFLUOROETHYL RADICALS

1966 ◽  
Vol 44 (2) ◽  
pp. 171-177 ◽  
Author(s):  
G. O. Pritchard ◽  
J. R. Dacey ◽  
W. C. Kent ◽  
C. R. Simonds
Keyword(s):  
Hydrogen Abstraction ◽  
Arrhenius Parameters

With perfluoroazoethane as a photolytic source of C2F5 radicals, the hydrogen abstraction reactions of C2F5 with deuterium, ethane, cyclohexane, acetone, and trifluoroacetaldehyde have been studied, and the Arrhenius parameters derived. The H-atom abstraction reactions of the three perfluoroalkyl radicals, CF3, C2F5, and C3F7, are discussed.

Reactions of methyl radicals. V. Hydrogen abstraction from hydrogen sulfide

1983 ◽  
Vol 36 (11) ◽  
pp. 2195 ◽  
Author(s):  
H Arican ◽  
NL Arthur
Keyword(s):  
Hydrogen Sulfide ◽  
Rate Constant ◽  
Hydrogen Abstraction ◽  
Methyl Radicals ◽  
Arrhenius Parameters ◽  
Temperature Range

Hydrogen abstraction from H2S by CH3 radicals, produced by the photolysis of azomethane, has been studied in the temperature range 334-432 K. The rate constant, based on the value 1013.34 cm3 mol-1 s-1 for the recombination of CH3 radicals, is given by log k4 = (11.00 � 0.01) - (8760 � 80)/19.145T where k4 is in cm3 mol-1 s-1 and E is in J mol-1. The previous data reported for this reaction are discussed and best values for its Arrhenius parameters are recommended. The results indicate that CH3 radicals react faster than CF3 radicals with H2S; this confirms the importance of polar effects in the hydrogen abstraction reactions of CF3 radicals.

THE HYDROGEN-ABSTRACTION REACTIONS IN THE PHOTOLYSIS OF PENTAFLUOROPROPANAL AND HEPTAFLUOROBUTANAL

1962 ◽  
Vol 40 (9) ◽  
pp. 1830-1835 ◽  
Author(s):  
G. O. Pritchard ◽  
G. H. Miller ◽  
J. K. Foote
Keyword(s):  
Hydrogen Abstraction ◽  
Arrhenius Parameters ◽  
Radical Recombination

The main products of the photolysis of the aldehydes at 3130 Å were determined and the rates of H-atom abstraction relative to radical recombination were measured. They are [Formula: see text] for C2F5CHO, and [Formula: see text] for C3F7CHO. The derived Arrhenius parameters are compared with those determined in the photolysis of CF3CHO, and also with the non-fluorinated aldehydes.

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