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The azoethane-initiated thermal reaction of isobutene. Heat of formation of the 2-methyl-2-pentyl radical

✍ Scribed by L. Seres; M. Görgényi; J. Farkas

Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
534 KB
Volume
15
Category
Article
ISSN
0538-8066

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✦ Synopsis

The azoethane-sensitized thermal reaction of isobutene has been studied at 526-565 K.

The initial concentrations of azoethane and isobutene were in the ranges of 1.40-10.5 X and 6.78-26.6 X mol/dm3, respectively. From the initial rates of formation of ethane and 2-methylpentane the heat of formation of the 2-methyl-2-pentyl radical was determined. The result obtained is q(2-methyl-2-pentyl) = 0.8 f 2.0 kcal/mol. The entropy of the radical, obtained from statistical mechanical calculations and experimentally, is S0(2methyl-2-pentyl) = 92.8 f 1.5 cal/mol-K. The results support the high heat of formation of the t -butyl radical suggested by different authors.

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