Tetrahedron p. 2911 - 2916 (1990)
Update date:2022-08-11
Topics:
Al-Awadi, Nouria A.
Al-Bashir, Rasha F.
ElDusouqui, Osman M. E.
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 ρ0 substituent constants of the heterocyclic groups are: 0.53, -0.13, 0.42, -0.26, 0.55 and 0.88, respectively.The reported ρ0 constants are in agreement with other gas-phase and solution data, and are amenable to rationalization in terms of normal electronic and structural effects.Further, the physical constants of four new isopropyl heteroarylcarboxylate esters are described.
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