Pseudo-first-order rate constants (k obs ) for hydrolysis of a sulfonylurea herbicide, azimsulfuron, AZIM, {N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbony]-1-methyl-4-(2-methyl-2H-tetrazol-5-yl)-1H-pyrazole-5-sulfonamide} (AZS) follow an empirical relationship:] 2 within the [NaOH] range of 0.1-2.0 M at different temperatures ranging from 40 to 55ЊC. The contribution of ␣ 3 [ Ϫ OH] 2 term is small compared with ␣ 2 [ Ϫ OH] term and this turns out to be zero at 60ЊC. Pseudo-first-order rate constants (k obs ) for hydrolysis of AZS within the [H ϩ ] range from 2.5 ϫ 10 Ϫ6 to 1.4 M follow the relationship: k obswhere pK a ϭ 4.37 at 50ЊC. The value of  1 is nearly 25 times larger than that of ␣ 1 . The rate of alkaline hydrolysis of AZIM is weakly sensitive to ionic strength.
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