Thermodynamic Study on tautomerism reactions of some benzoin compounds by halogen titration method

Abstract

The study is started with the synthesis of benzoin, 4-methoxybenzoin and 4-
nitrobenzoin by well known method. Their structures are confirmed by physical
methods such as m.p., UV and IR spectra. The study deals with the tautomerism
reactions of type enediol keto form by simple halogen titration method. The
results show that the keto forms in compounds stated are predominant in benzoin and
4-methoxybenzoin shows a similar result at only 298K, and reverse results at other
higher temperatures. Finally, the calculated thermodynamic parameters were
estimated, namely ΔG,ْ ΔH and ΔS support, the tautomerism reactions stated.