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Kinetics and thermodynamic studies of chlorination of N-(p-substituted phenyl) -3,5- dimethyl -1, 1- dioxo-1,2-thiazine (C4H2(CH3)2SO2 N C6H4-X); {X = H, p-Cl, and p-OCH3} by using sulfuryl chloride (SO2Cl2) in chloroform medium have been investigated by Isolation method the observed rate of chlorination pseudo first order for 1,2-thiazine and SO2Cl2 and second order in overall reaction and using conductivity method. The reaction rate constant increases with increasing temperature from 273K to 318K. The kinetic and thermodynamic parameters k, Ea, ΔH # and ΔS # have been calculated. The corresponding halogenated 1,2- thiazine has been identified as a product of halogenation. A suitable reaction scheme is proposed and an appropriate rate law is deduced to account for the observed kinetic and thermodynamic data. Keywords :Sultam, Chlorination (SO2Cl2), Kinetic, thermodynamic, conductivity. (2,3) . As a consequence, chemical syntheses towards sultams have continued to be an attractive topic for intense research (4) . Sultams {1} are inner Sulfonamides in which the S-N bond is part of a ring, the tautomeric forms of sultams, having a sulfur-nitrogen double bond as part of a ring, are called Sultimes {2}. The chemical composition of which corresponds to the general formula (5) :

Kinetics and Thermodynamic Studies of the Chlorination Of Sultams Using Conductivity Measurements