Abstract

ESPITIA, Amelia A  and  LAFONT, Jennifer J. KINETICS AND MECHANISM OF THE THERMAL DECOMPOSITION OF ETHYL NIPECOTATE AND ETHYL ISONIPECOTATE. Inf. tecnol. [online]. 2013, vol.24, n.6, pp.59-66. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642013000600009.

The objective of this study was to carry out the thermolysis of two compounds not yet reported in literature: ethylnipecotate and ethyl isonipecotate, in order to find the thermal degradation rate constants and the activation parameters and to propose a reaction mechanism. The thermolysis experiments were performed in a chemical minireactor at five temperatures between 523K and 563K with ten degrees difference; the values of the areas were measured with a gas chromatography coupled to mass spectrometry, also used in the identification of products of each reaction. It was found that ethyl nipecotate was degraded faster than ethyl isonipecotate and in both reactions the rate constants increased with the temperature and demonstrated to be unimolecular and of first order. A mechanism is proposed with a concerted, semi-polar six-member cyclic transition state.

Keywords : kinetics; reaction mechanism; thermal decomposition; ethyl nipecotate; ethyl isonipecotate.

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