Structure identification of substituted phenol redox products by: thermogravimetric and differential thermal analysis

Abstract

The structure of separated pure products obtained by oxidation of bromo- and chlorophenols with iodine were investigated by microanalysis, infrared (IR) spectroscopy and by differential thermal analysis (DTA) and thermogravimetric analysis (TGA) to elucidate their molecular formulae. DTA analysis together with the IR spectral studies support the picture developed from TGA. This indicates that not only the crystallization water was lost but also the functional decomposition of these parent halogenated phenols is necessarily needed (as sublimation of some native iodine molecules) to interpret the successive mass lost. This structure elucidation confirms the previously reported mechanism of such redox reactions.