PROCESS FOR THE PRODUCTION OF NITROBENZOLES

摘要

The present invention relates to a process for the preparation of compounds of formula (I) wherein the substituents are as defined in claim 1, by reaction of a compound of formula (II) wherein the substituents are as defined in claim 1, either a1) with triphenylphosphine dibromide or triphenylphosphine dichloride or a2) with RSO₂CI, wherein R is C₁C₄alkyl, C₁-C₄ fluoroalkyl, benzyl, phenyl, nitrophenyl, halophenyl or C₁-C₆alkylphenyl, in the presence of a base, to form a compound of formula (III) wherein the substituents are as defined in claim 1 ; and conversion of that compound in the presence of a base into a compound of formula I, and also to novel nitrobenzene intermediates for use in that process.