Issue 3, 1970

The synthesis of potential insecticides. Part II. Carbamic esters of 4-alkylthiopyrazolones

Abstract

By use of 2-(alkylthio) acetoacetic esters, for which an improved synthesis is described, a series of 4-alkylthio-2-pyrazolin-5-ones has been prepared and these have been converted into their methyl- and dimethyl-carbamic esters. In an alternative approach to these esters, methylthio-groups were introduced directly into the 4-position of certain 4-unsubstituted pyrazol-5-yl carbamates by reaction with methanesulphenyl chloride. Oxidation of the 4-alkylthiopyrazol-5-yl carbamates gave good yields of the corresponding sulphoxides and sulphones.

Article information

Article type
Paper

J. Chem. Soc. C, 1970, 445-448

The synthesis of potential insecticides. Part II. Carbamic esters of 4-alkylthiopyrazolones

I. T. Kay, D. J. Lovejoy and S. Glue, J. Chem. Soc. C, 1970, 445 DOI: 10.1039/J39700000445

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