Riedel-De Haen Aktiengesellschaft

Hans-Jurgen Schmidt

Gunter Bartels

Horst Schmand

Bernd Kellermeier

The present invention relates to a process for the preparation of compounds of the general formula I ##STR1## in which X and Y, independently of each other, represent hydrogen, fluorine, chlorine or bromine, but cannot simultaneously represent hydrogen, characterised in that compounds of the general formula II ##STR2## in which X and Y are defined as above, are reacted with aqueous ammonia under copper catalysis, and to intermediates for the preparation of compounds of the general formula I.

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Seelze, Germany

Hans-Jurgen Schmidt