Hoechst Aktiengesellschaft

Clariant Corporation

Clarient Gmbh

Weylchem Frankfurt Gmbh

Karl-Ernst Mack

Daniel Decker

Norbert Beye

Hans-Jürgen Leitung

Method of hydrodechlorinating nuclear-chlorinated o-xylenes and recovering o-xylene, forming hydrogen chloride, the nuclear-chlorinated o-xylenes being hydrogenated in the gas phase at a noble-metal-containing catalyst at a temperature in the range from 220 to 360&#xb0; C. The catalyst preferably comprises palladium or platinum, in particular supported palladium or platinum. The nuclear-chlorinated o-xylenes can be used individually or as mixtures.

Method of hydrodechlorinating nuclear-chlorinated ortho-xylenes

A method for the nuclear chlorination of ortho-xylene using a chlorinating agent in the presence of at least one Friedel-Crafts catalyst and chloro-substituted 2,8-dimethylphenoxathiin as co-catalyst. The co-catalyst used is preferably tetrachlorinated 2,8-dimethylphenoxathiin, in particular 1,3,7,9-tetrachloro-2,8-dimethylphenoxathiin of the formula

Method for the nuclear chlorination of ortho-xylene

N-(4-Bromo-2-fluorobenzyl)carbamates and a process for their preparation The invention relates to N-(4-bromo-2-fluorobenzyl)carbamates of the formula (I), ##STR1## where R is (C.sub.1 -C.sub.12)alkyl, benzyl or phenyl, where the benzyl and phenyl radicals can also be substituted by (C.sub.1 -C.sub.3)alkyl or (C.sub.1 -C.sub.3)alkoxy, and to a process for preparing these compounds.

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Wiesbaden, Germany

Karl-Ernst Mack