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
The gas-phase elimination kinetics of the above-mentioned compounds were determined in a static reaction system over the temperature range of 369-450.3• C and pressure range of 29-103.5 Torr. The reactions are homogeneous, unimolecular, and obey a first-order rate law. The rate coefficients are given by the following Arrhenius expressions: ethyl 3-(piperidin-1-yl) propionate, log k 1 (s −1 ) = (12.79 ± 0.16) − (199.7 ± 2.0) kJ mol −1 (2.303 RT) −1 ; ethyl 1-methylpiperidine-3-carboxylate, log k 1 (s −1 ) = (13.07 ± 0.12)-(212.8 ± 1.6) kJ mol −1 (2.303 RT) −1 ; ethyl piperidine-3-carboxylate, log k 1 (s −1 ) = (13.12 ± 0.13) − (210.4 ± 1.7) kJ mol −1 (2.303 RT) −1 ; and 3-piperidine carboxylic acid, log k 1 (s −1 ) = (14.24 ± 0.17) − (234.4 ± 2.2) kJ mol −1 (2.303 RT) −1 . The first step of decomposition of these esters is the formation of the corresponding carboxylic acids and ethylene through a concerted six-membered cyclic transition
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