Hoechst Aktiengesellschaft

Gert Volkwein

Konrad Baessler

Hubert Schonowsky

Hans Wolfram

Process for the preparation of 4-phenoxyphenols of the formula ##STR1## in which R.sup.1 through R.sup.5 are hydrogen, halogen or alkyl, by diazotization of amines of the formula ##STR2## in a hydrochloric acid medium, and boiling in aqueous sulfuric acid at 110.degree. to 150.degree. C.

Process for the preparation of 4-phenoxyphenols

1,3,5-trichlorobenzene is manufactured by treating 5-chloro-1,3-dinitrobenzene and/or 3,5-dichloronitrobenzene with chlorine, at a temperature from about 200.degree. to 270.degree. C., preferably from about 230.degree. to 250.degree. C. The resulting process product is an intermediate, for example in plant protection.

Process for the manufacture of 1,3,5-trichlorobenzene

2,4-DINITROANILINE IS OBTAINED IN HIGH YIELD AND QUALITY IN A SAFE REACTION BY INTRODUCING 4-CHLORO-1,3-DINITROBENZENE INTO AT LEAST THREE-FOLD STOICHIOMETRIC AMOUNT OF AQUEOUS AMMONIA OF A CONCENTRATION OF 15 TO 40% BY WEIGHT AT A TEMPERATURE OF 60.degree. TO 90.degree. C.

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Kelkheim, Germany

Gert Volkwein