Tetrahedron

Gas-phase pyrolytic reactions. part 4.1 Arrhenius parameters and hammett σ0 constants in gas-phase eliminations of alkyl pyridyl,-furyl-, and thienylcarboxylate esters

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. 2911 - 2916

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Citation Number: 3

Abstract

The first-order rate coefficients (105K/s-1) of the gas-phase pyrolytic reactions of seven isopropyl (hetero) arylcarboxylate esters were calculated for 600 K to be: 75.34 for benzoate, and 100.0, 70.46, 94.03, 65.58, 100.9 and 120.2 for 2-thienyl-, 3-thienyl-, 2-furyl, 3-furyl, 3- pyridyl-and 4-pyridylcarboxylate, respectively. The corresponding Hammett replacement σ0 substituent constants of the heterocyclic groups are: 0.53,-0.13, 0.42,-0.26, 0.55 and 0.88, ...