Reduction of the Carbamate Pesticides Oxamyl and Methomyl by Dissolved Fe<sup>II</sup> and Cu<sup>I</sup>
作者:Timothy J. Strathmann、Alan T. Stone
DOI:10.1021/es001824j
日期:2001.6.1
carbamates undergo a net two-electron reduction that is coupled to the sequential one-electron oxidation of two Fe(II) ions. The observed products are a substituted nitrile, methanethiol, and methylamine. A radical intermediate is inferred by polymerization of the radical scavenger acrylonitrile. Redox kinetics (i) vary with carbamate identity, (ii) exhibit first-order dependence on both Fe(II) and carbamate
A process is provided for the manufacture of methomyl oxime comprising the steps of chlorinating acetaldoxime dissolved in N-methylpyrrolidone at a temperature range of -10.degree. C. to 0.degree. C. to form a N-methylpyrrolidone solution of acethydroxamoyl chloride; thioesterifying the acethydroxyamoyl chloride in said solution at a temperature range of about 0.degree. C. to 10.degree. C. at pH in the range 6-7.