Patent ID: 6133451
Filing Date: 2000-10-17
Classification: C07C,C07D

Abstract:
A process for preparing 2-(3-pyrazolyloxymethylene)nitrobenzene derivatives of the formula I ##STR18## where: R.sup.1 is halogen;unsubstituted or substituted alkyl or alkoxy;R.sup.2 is cyano, halogen, alkyl, haloalkyl, alkoxy, alkylthio or alkoxycarbonyl;R.sup.3 is unsubstituted or substituted alkyl, alkenyl or alkynyl;unsubstituted or substituted saturated or mono- or diunsaturated carbocyclyl or heterocyclyl;unsubstituted or substituted aryl or hetaryl;m is 0, 1 or 2, it being possible for the substituents R.sup.2 to be different when m is greater than 1;n is 0, 1, 2, 3 or 4, it being possible for the substituents R.sup.1 to be different when n is greater than 1;by bromination of an o-nitrotoluene of the formula II ##STR19## where R.sup.1 has the abovementioned meaning, to give the o-nitrobenzyl bromide of the formula III ##STR20## in the presence of a nonpolar, aprotic solvent and subsequent reaction of the resulting solution of III with a 3-hydroxypyrazole of the formula IV ##STR21## where R.sup.2 and R.sup.3 have the abovementioned meanings, in the presence of a base, wherein the solution of the o-nitrobenzyl bromide III resulting from the bromination is reacted further with IV, in the solvent used, directly without intermediate isolation of the o-nitrobenzyl bromide III.