Patent ID: 8124813

Claim:
A process for preparing a compound of general formula (IA) in which R 1 is hydrogen, a branched or unbranched C 1 -C 12 -alkyl radical, an electron-deficient C 5 -C 6 -arly or heteroaryl radical which is unsubstituted or substituted by halogen, an NO 2 , —CN, —CF 3 or acyl group or a branched or unbranched alkyl group, and R 2 is a branched or unbranched C 1 -C 5 -alkyl radical or the two R 2 radicals are bonded to one another directly or via a C 1 -C 4 unit, Y one Y is always hydrogen and the other Y is an —NO 2, —CN or —CF 3 radical or fluorine or chlorine, or the two Y radicals are each independently an NO 2 , CN or CF 3 radical or fluorine or chlorine, Z is hydrogen or an —NO 2 radical or branched or unbranched C 1 -C 6 -alkyl radical or acyl radical, by reacting a 2-hydroxyacetal compound of the general formula (II) in which R 1 and R 2 are each as defined for formula (Ia) with a substituted aromatic of the general formula (III) in which Y is as defined for formula (I) and X is fluorine, chlorine, bromine or an NO 2 group, in the presence of a base, characterized in that the reaction is performed in anhydrous dimethylformamide as a solvent.