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  • Chem Sci Trans., 2015, 4(1),  pp 289-295  

    DOI:10.7598/cst2015.972

    Research Article

    Comparative Degradation Kinetic Studies of Tetrabutyl-ammonium Tribromide (TBATB) and Cetyltrimethyl-ammonium Tribromide(CTMATB) - A Route to Reactivity Assessment for Solvent-Free Reactions

  • NEIVOTSONUO B. KUOTSU1*, CHUBAAKUM PONGEN2, TOVISHE PHUCHO2 and UPASANA B. SINHA2
  • 1Department of Chemistry, Kohima Science College, Jotsoma-797002, Kohima, Nagaland, India
    2Department of Chemistry, Nagaland University, Lumami-798627, Nagaland, India
  • Abstract

    Tetrabutylammonium tribromide (TBATB) and cetyltrimethylammonium tribromide (CTMATB) are important alternatives to the hazardous reagent bromine (Br2) 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

    Keywords

    Tetrabutylammonium tribromide, Cetyltrimethylammonium tribromide, Thermal analysis, Brominations, Solvent-free, Environmentally benign

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