SUBSTITUTED AROMATIC ANILS - A KINETIC STUDY USING PYRIDINIUM CHLOROCHROMATE ( PCC )
Dr.V.Krishnasamy1 , S.Rosy Christy2
1Prof. & H.O.D. of Chemistry , Bharath University, Selaiyur , Chennai - 600073 , India
2 Assistant Professor of Chemistry , Bharath University ,Selaiyur , Chennai - 600 073, India
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The kinetics of co - oxidation study of anils and oxalic acid by PCC in aqueous acetic acid had been studied under different experimental conditions. The order is one with respect to oxalic acid , anil , and PPC. The order is 1.5 with respect to [ H+ ]. The oxidation was found to increase with increase of perchloric oxalic acids. The rate of the reaction was increased by the addition of NaClo4 . The protonated species of the oxidant is involved in the rate - determining step. The effect of various meta and para - substituted anils on the reaction rate had been studied at four different temperatures viz., 35 , 40 , 45 and 50 0 c and the thermodynamic parameters are also calculated. The analysis of rate constants of ortho substituents reveas that the localized and delocalized effects are major components while steric effect place only the minor role.