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The mechanism of the elimination kinetics of 2‐bromo‐2‐butene in the gas phase
Author(s) -
Chuchani Gabriel,
Dominguez Rosa M.
Publication year - 1990
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550220302
Subject(s) - chemistry , hydrogen bromide , kinetics , catalysis , arrhenius equation , bromide , torr , vinyl bromide , atmospheric temperature range , allyl bromide , reaction rate constant , hydrogen , 2 butene , elimination reaction , reaction mechanism , order of reaction , gas phase , photochemistry , medicinal chemistry , activation energy , thermodynamics , inorganic chemistry , organic chemistry , bromine , physics , quantum mechanics
Abstract The kinetics of the gas phase elimination of 2‐bromo‐2‐butene were determined in a static system over the temperature range of 340–380°C and pressure range of 37–134 torr. The reaction in seasoned vessels, even in the presence of a free radical inhibitor, is catalyzed by hydrogen bromide. Under maximum catalysis of HBr, the kinetics were found to be of order 1.0. The reaction, when maximally catalyzed with HBr, appears to undergo a molecular elimination of HBr which follows first‐order kinetics. The products are 1,2‐butadiene and hydrogen bromide. The rate coefficients. under maximum catalysis, are given by the Arrhenius equation log 1 (s −1 ) = (13.57 ± 0.56) − (200.4 ± 6.8) kJ mol −1 (2.303 RT ) −1 . The catalyzed pyrolysis of 2‐bromo‐2‐butene appears to proceed through a six‐membered cyclic transition‐state type of mechanism.