Abstract
Tetrabutylammonium tribromide (TBATB) and cetyltrimethylammonium tribromide (CTMATB) are important alternatives to the hazardous reagent bromine (Br 2) because of their efficiency in various chemical transformations, especially organic bromination reactions. In the context of green chemistry, development of solvent-free reaction protocols is much needed because of the hazards posed by organic solvents. In order to assess the comparative behavior of these tribromides in solvent-free reactions at elevated temperatures, thermogravimetric studies came in as a useful tool. Thus, the kinetics of the thermal degradation of TBATB and CTMATB were investigated through thermogravimetric analysis and the thermal stability order of the two bromides based on TG followed the order: CTMATB>TBATB. Non isothermal multiple heating rate model free methods Ozawa-Flynn-Wall and Kissinger methods are used to calculate degradation activation energy of the tribromides. The reaction mechanism based on activation energy calculation at different conversions has been proposed
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