Journal of Physical Chemistry p. 206 - 208 (1989)
Update date:2022-08-31
Topics:
Chuchani, Gabriel
Dominguez, Rosa M.
Rotinov, Alexandra
Martin, Ignacio
The kinetics of the gas-phase pyrolysis of 2-bromobutane and 2-bromopentane were determined in a static system over the temperature range of 310-360 deg C and the pressure range of 40-180 Torr.The reactions in seasoned vessels, and in the presence of a free-radical inhibitor, are homogeneous, are unimolecular, and follow a first-order rate law.The temperature dependence of the rate coefficients is given by the following Arrhenius equations: for 2-bromobutane, log k1(s-1) = (13.04+/-0.05)-(188.3+/-0.6) kJmol-1 (2,303RT)-1; for 2-bromopentane, log k1(s-1) = (13.08+/-0.23)-(187.0+/-2.7)kJmol-1 (2.303RT)-1.The olefin products appear to rapidly isomerize in the presence of HBr gas until an equilibrium is reached.The elimination kinetics of these compounds suggest that the effect of the alkyl groups R in RCHBrCH3 is polar (+I electron release).
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