ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 20, Number 6
JKCSEZ 20(6)
December 20, 1976 

The rate of the bromine-exchange reaction between gallium bromide and n-butyl bromide in 1,2,4-trichlorobenzene and in nitrobenzene was measured at 19, 25 and 40℃., using n-butyl bromide labelled with Br-82. The results indicated that the exchange reaction was second order with respect to gallium bromide and first order with respect to n-butyl bromide. The third-order rate constant determined at 19℃. is 1.15×10-4 l2·mole-2·sec-1 in 1,2,4-trichlorobenzene and 4.21×10-4 l2·mole-2·sec-1 in nitrobenzene. The activation energy, the enthalpy of activation and the entropy of activation for the exchange reaction were also determined.