n, n - dimethyl - 0 - (- carbamoyl - 5 - pyrazolyl) carbaminsyreestere, process for their manufacture and their use as agents for the control of harmful organisms

摘要

N,N-dimethyl O-(1-carbamoyl-pyrazol-5-yl) carbamates of the formula IMAGE (I) in which R1, R2 and R3, independently of one another, represent a hydrogen atom or an optionally substituted alkyl group, and R4 represents an alkoxy, alkylthio, alkylsulphinyl or alkylsulphonyl group, are new and are obtained when a 5-hydroxy-pyrazole of the general formula IMAGE (II) or an alkali metal salt or alkaline earth metal salt thereof, is reacted with an N,N-dimethyl-carbamic acid-halide of the general formula HalCON(CH3)2 (III) in which Hal represents a chlorine or bromine atom. The compounds of formula (I) can be used as pest-combating agents, especially in combating insects or acarids.