Abstract
AbstractThe kinetics of reaction of substituted 2‐aminobenzothiazoles and phenacyl bromide have been followed conductometrically and in some cases, argentometrically. Both the methods produced almost the same rate constants. Substituents at position 5 of the benzothiazole nucleus behave like para substituents of the benzene ring. A correlation with Hammett σp substituent constants has been obtained with a rho value of −1.04. The rate data of quaternization reaction of 4, 5, and 6 substituted 2‐aminobenzothiazoles with phenacyl bromide have been correlated with Fk, Rk, and Vw values by multiple regression analysis with the equation suggested by Williams and Norrington and modified by us. The values are found to correlate well with the equation, log k = −4.4979 − 0.4815fjFk + 0.5933rjRk − 0.0277Vw.
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