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The reactions of CF3 and CD3 radicals with boron trimethyl

✍ Scribed by T. N. Bell; A. E. Platt

Publisher: John Wiley and Sons
Year: 1971
Tongue: English
Weight: 453 KB
Volume: 3
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550030403

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✦ Synopsis

Hydrogen abstraction from boron trimethyl has been studied using the abstracting radicals CF3 and CD3, from the photolysis of the corresponding ketones over the temperature range of 150° to 300°C. The following Arrhenius parameters were obtained:

98 kcal/mole (CFJ + BMe3); log A = 11.6, E = 6.59 kcal/mole The difference E C D , -E C F , in the case of BMe3 is considered due, in part, to polar effects. An exchange reaction is proposed for both CF3 and CD3 in collisions with BMe3: R + B(Me)3 -+ Me + RBMe2 Radical combination of CF3 and CH2BMe2 leads to a hot molecule which undergoes a 8-fluoro rearrangement elimination process, or a stabilized molecule which can thermally decompose: (CF3CH2BMe2) * -+ CF2CH2 + FBMe2

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