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The elimination kinetics of 2-bromo-3-methylbutyric acid in the gas phase

✍ Scribed by Gabriel Chuchani; Rosa M. Dominguez

Publisher: John Wiley and Sons
Year: 1995
Tongue: English
Weight: 210 KB
Volume: 27
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550270110

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✦ Synopsis

The kinetics of 2-bromo-3-methylbutyric acid in the gas phase was studied over the temperature range of 309.3-357.0"C and pressure range of 15.5-100.0 torr. This process, in seasoned static reaction vessels and in the presence of the free radical inhibitor cyclohexene, is homogeneous, unimolecular, and follows first-order rate law. The observed rate coefficients are represented by the following Arrhenius equations: log k l ( s -l ) = (12.72 2 0.25) -(181.8 ? 2.9) kJ m01-~(2.303RT)-~. The primary products are isobutyraldehyde, CO, and HBr. The polar five-membered cyclic transition state type of mechanism appears to be preferred in the dehydrohalogenation process of a-haloacids in the gas phase.

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