Journal of Physical Chemistry p. 6277 - 6281 (1986)
Update date:2022-08-11
Topics:
Dominguez, Rosa M.
Rotinov, Alexandra
Chuchani, Gabriel
The kinetics of the gas-phase pyrolysis of several secondary chlorides were determined in a static system over the temperature range 369.9-490.1 deg C and the pressure range of 28-298 Torr.The reactions in seasoned vessels, with the free radical suppressor propene and/or toluene always present, are homogeneous and unimolecular and obey a first-order rate law.The observed rate coefficients are represented by the following Arrhenius equations: for 2-chloropropionitrile, log k1 (s-1) = (13.45+/-0.57)-(236.1+/-8.2) kJ mol-1; for methyl 2-chloropropionate, log k1 (s-1) = (12.22+/-0.54) - (217.0+/-7.4) kJ mol-1 (2.303RT)-1; for methyl 3-chlorobutyrate, log k-1 (s-1) = (13.65 +/-0.39)-(214.9+/-5.0) kJ mol-1 (2.303RT)-1.The data of this work together with those reported in the literature confirm previous correlations that α-alkyl substituents of ethyl chloride give a good straight line, when log k/k0 vs. ?* values (ρ* = -3.58 +/- 0.24, correlation coefficient = 0.996, and intercept = -0.0066 at 360 deg C) are plotted, while α-polar substituents give rise to an inflection point at ?*(CH3) = 0.00 into another straight line (ρ* = -0.46+/-0.06, correlation coefficient = 0.972, and intercept = 0.017 at 360 deg C).Several other polar α-substituents have been found to enhance the dehydrochlorination process by means of their electron delocalization or resonance effect.Revising a work reported on the pyrolysis kinetics of pinacolyl chloride, a Wagner-Meerwein rearrangement appears to be a reasonable explanation for the formation of about 12percent of the 2,3-dimethylbutene products.
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