Process for the production of 3-hydroxy-1,2,4-triazole derivatives

Abstract

A process for the production of 3-hydroxy-1,2,4-triazole derivatives of formula I ##STR1## wherein R.sub.1 and R.sub.2 each represent a straight-chain or branched-chain alkyl group having 1 to 6 carbon atoms, or a cycloalkyl group having 3 to 6 carbon atoms, and X represents oxygen or sulphur, Which process comprises adding to a 1-alkyl-1-cyanohydrazine of formula II ##STR2## wherein R.sub.1 has the meaning given under formula I, a compound of formula III r.sub.2 -- xh (iii) wherein R.sub.2 and X have the meanings given under formula I; and subsequently cyclising the addition product by reaction with a compound of formula IV ##STR3## wherein R.sub.3 and R.sub.4 independently of one another represent chlorine or an alkoxy group having 1 to 4 carbon atoms. The 3-hydroxy-1,2,4-triazole derivatives are valuable intermediates for producing phosphoric acid esters which can be used as pesticidal agents, particularly as insecticides and nematicides.

Dependencies are inferred from the claim text.