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Kinetic studies of the reactions CH 2 I 2 + HI⇄CH 3 I + I 2 and 2 CH 3 I⇄CH 4 + CH 2 I 2 the heat of formation of the iodomethyl radical
Author(s) -
Furuyama Shozo,
Golden David M.,
Benson Sidney W.
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.550010302
Subject(s) - chemistry , disproportionation , reaction rate constant , standard enthalpy of formation , kinetic energy , medicinal chemistry , kinetics , mole , catalysis , organic chemistry , physics , quantum mechanics
The rate of the reaction CH 2 I 2 + HI ⇆ CH 3 I + I 2 has been followed spectrophotometrically from 201.0 to 311.2°. The rate constant for the reaction fits the equation, log ( k 1 / M −1 sec −1 ) = 11.45 ± 0.18 ‐ (15.11 ± 0.44)/θ. This value, combined with the assumption that E 2 = 0 ± 1 kcal/mole, leads to Δ H f298 °(CH 2 I, g) = 55.0 ± 1.6 kcal/mole and DH 298 °(HCH 2 I) = 103.8 ± 1.6 kcal/mole. The kinetics of the disproportionation, 2 CH 3 I ⇆ CH 4 + CH 2 I 2 were studied at 331° and are compatible with the above values.