✦ LIBER ✦

Kinetics and mechanism of thermal gas-phase elimination of 2-aryloxyacetic acid

✍ Scribed by Nouria A. Al-Awadi; Ajith Kumar; Gabriel Chuchani; Armando Herize

Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 108 KB
Volume: 33
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.1058

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✦ Synopsis

Abstract

Rates of thermal gas‐phase elimination of eleven 2‐aryloxyacetic acid have been measured over a 45°C temperature range for each compound. Hammett correlation of the present kinetic data with the literature σ^0^ values of the given substituents gave a reaction ρ constant of 0.69 at 600 K; this is more than that for the gas‐phase elimination parameter of 2‐aryloxypropanoic acid (ρ = 0.26) and consistent with a transition state with some charge separation, suggesting a partial formation of carbocation. The implications of this observation for the thermal gas‐phase elimination of α‐aryloxycarboxylic acids are considered. © 2001 John Wiley & Sons, Inc. Int J Chem Kinet 33: 612–616, 2001

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