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Kinetics of the gas-phase reaction of cyclopropylcarbinyl iodide and hydrogen iodide. Heat of formation and stabilization energy of the cyclopropylcarbinyl radical

✍ Scribed by Donald F. McMillen; David M. Golden; Sidney W. Benson

Publisher
John Wiley and Sons
Year
1971
Tongue
English
Weight
721 KB
Volume
3
Category
Article
ISSN
0538-8066

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✦ Synopsis

The rate of the gas phase reaction A-CH,-I + I . 5 A-CH~. + I, has been measured spectrophotometrically over the range 480Β°-5500K. fits the equation log k (M-l sec-l) = 11.4 f 0.1 -(16.8 i 0.2)/8

where e = 2.303RT in kcal/mole. This result, together with the assumption that the activation energy for the back reaction is 0 + 1 kcal/mole, allows calculation of

OH$'* (A-CH,-H)

= 97.4 f 1.6 kcal/mole and AHFz98 (A-CH~.) = 51.1

1.6 kcal/mole. These values correspond to a stabilization energy of 0.4 f 1.6 kcal/mole in the cyclopropylcarbinyl radical.

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