✦ LIBER ✦

Kinetics and equilibria of the reaction between bromine and ethyl ether. The CH bond dissociation energy in ethyl ether

✍ Scribed by Osamu Kondo; Sidney W. Benson

Publisher: John Wiley and Sons
Year: 1984
Tongue: English
Weight: 467 KB
Volume: 16
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550160802

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✦ Synopsis

The kinetics and equilibria of the reaction: Br + CH,CH20CH2CH3 & HBr + CH3CHOCH2CH, have been studied in the temperature range 298-333 K by using the very low pressure reactor (VLPR) technique. Combining the estimated entropy change of reaction (11, AS; = 8.1 2 1.0 eu, with the measured AG;, we find AH, = 4.2 ? 0.4 kcal/mol; AHgCH,CHOC2H,) = -20.2 kcal/mol, and DH" [Et OCH(Me)-HI = 91.7 c 0.4 kcal/mol. We find: log k, (l/mol s) = 10.8 ( 2 0 . 7 ) -(3.9 c l.O)/O

where 6 = 2.3 RT in kcal/mol. It has been shown that the reaction proceeds via a loose transition state and the "contact 2' s" model calculation gives a very good agreement with the observed value.

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