Tetrahedron

Gas-phase pyrolytic reactions. part 3. Hammett ϱ constants of gas-phase eliminations of alkyl arylcarboxylate and ethanoate esters and their correlation with substrate …

NA Al-Awadi, RF Al-Bashir, OME ElDusouqui

Index: Al-Awadi, Nouria A.; Al-Bashir, Rasha F.; ElDusouqui, Osman M. E. Tetrahedron, 1990 , vol. 46, # 8 p. 2903 - 2910

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Citation Number: 8

Abstract

The kinetics of the gas-phase thermal elimination of seven tert-butyl (hetero) arylcarboxylate esters (GCO2But) were measured over a temperature range= 50 K; the groups were the phenyl, 3—and 4—pyridyl, 2—and 3-fnryl, and 2—and 3—thienyl moieties. The reactions were homogeneous and unimolecular with log A/s-1scaling 12.45±0.44, and with an entropy of activation uniformly negative and small. The kinetics obeyed a first-order rate equation, ...

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