Studies on N-Nitroso Derivatives of N-Methylcarbamate Insecticides (II)

Kinetical Studies on the N-Nitrosocarbamate Formation from 3-Methylphenyl N-Methylcarbamate or 3, 4-Dimethylphenyl N-Methylcarbamate and Sodium Nitrite

抄録

The rates of formation of nitrosocarbamates, 3-methylphenyl N-methyl-N-nitrosocarbamate (NO-MTMC) and 3, 4-dimethylphenyl N-methyl-N-nitrosocarbamate (NO-MPMC), from sodium nitrite and N-methylcarbamate insecticides, 3-methylphenyl N-methylcarbamate (MTMC) and 3, 4-dimethylphenyl N-methylcarbamate (MPMC), were studied.
The initial rates of NO-MTMC formation were proportional to the concentration of MTMC and that of sodium nitrite in the ranges of 2.5-10 mM of MTMC and 25-100 mM of sodium nitrite at pH 2.0 and 37-C in aqueous solution, and the initial rates increased with increasing the acidity of reaction mixtures, being almost proportional to the hydrogen ion concentration from pH 3 to pH 1.5.
The initial rate of NO-MPMC formation was almost similar to that of NO-MTMC formation at pH 2.0 and 37-C in 20% dimethyl sulfoxide (1.1 times).