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Kinetics and mechanisms of gas phase elimination of ethyl 1-piperidine carboxylate, ethyl pipecolinate, and (revisited) ethyl 1-methyl pipecolinate

✍ Scribed by Felix Rosas; Angiebelk Monsalve; María Tosta; Armando Herize; Rosa M. Domínguez; Doris Brusco; Gabriel Chuchani

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
132 KB
Volume
37
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The kinetics of the gas‐phase elimination of the title compounds has been determined in a static reaction system over the temperature range of 340–420°C and pressure range of 45–96 Torr. The reactions proved to be homogeneous, unimolecular, and obey a first‐order rate law. The estimated rate coefficients are represented by the following Arrhenius expressions: Ethyl 1‐piperidine carboxylate
Ethyl pipecolinate
Ethyl 1‐methyl pipecolinate
The first step of decomposition of these esters is the formation of the corresponding carboxylic acids and ethylene. The acid intermediate undergoes a very fast decarboxylation process. The mechanism of this elimination reactions is suggested on the basis of the kinetic and thermodynamic parameters. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: 383–389, 2005

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