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Hydrogen abstraction reactions from organosilicon compounds. The reactions of methyl, trifluoromethyl, and ethyl radicals with trichlorosilane
Author(s) -
Kerr J. A.,
Stephens A.,
Young J. C.
Publication year - 1969
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550010403
Subject(s) - chemistry , radical , trichlorosilane , hydrogen atom abstraction , organosilicon , arrhenius equation , hydrogen , hydrogen atom , medicinal chemistry , photochemistry , organic chemistry , alkyl , activation energy , silicon
Arrhenius parameters have been determined for the hydrogen‐abstraction reactions:R + SiHCl 3 + RH + SiCl 3TextR Temp (°K) E (kcal/mole) Log A (mole −1 cc sec −1 ) Log k (400°K) (mole −1 cc sec −1 )CF 3 323–461 5.98 ± 0.06 11.77 ± 0.03 8.50 CH 3 333–443 4.30 ± 0.08 10.83 ± 0.04 4.48 C 2 H 5 314–413 5.32 ± 0.07 11.54 ± 0.04 8.63The trend in activation energies E CH 3< E C 2 H 5< E CF 3is interpreted as indicating a polar effect in the reaction of CF 3 with SiHCl 3 and the similar reactivities of all three radicals appear to be due to the high exothermicity of the reactions. The A Factors for the reactions are normal for hydrogen abstraction reactions of free radicals. The previous results of Kerr, Slater, and Young for CH 3 abstracting an H atom from SiHCl 3 have been amended.