Hoechst Aktiengesellschaft

Clariant Corporation

Hoechet Ag

Wilfried Pressler

Theodor Papenfuhs

Werner H Muller

Andreas Kanschik-Conradsen

Helmut Meidert

Gunter Roscher

Peter Klein

Andreas Meudt

Steffen Haber

Jochen Rapp

Robert Cosmo

Michael Erbes

Antje Noerenberg

Georg-Emrich Miess

Theodor Papenfhus

The invention relates to a process for the preparation of 4-(4&prime;-chlorobiphenyl-4-yl)-4-keto-2-methylenebutyric acid of the formula (I)

Process for the preparation of 4-(4'-chlorobiphenyl-4-yl)-4-keto-2-methylenebutyric acid

Process for the preparation of chlorofluronitrobenzenes and

A process for the preparation of chlorofluoronitrobenzenes in high yields, by reacting dichloronitrobenzenes with alkali metal fluorides having a water content of up to about 2.5% by weight in the presence of a quaternary ammonium and/or phosphonium salt, a crown ether and/or polyethylene glycol dimethyl ether as catalyst in the presence of an aprotic solvent, the boiling point of which is below the reaction temperature under the pressure conditions chosen, at temperatures of about 125.degree. to about 200.degree. C.

Process for the preparation of chlorofluoronitrobenzenes

The present invention relates to a process for the preparation of 1,2-bis-(2-nitrophenoxy)-ethane, by reacting 1 mole of ethylene glycol with about 190 to about 250 mol % of 2-chloronitrobenzene at temperatures of about 40.degree. to about 100.degree. C. with the addition of an alkali metal hydroxide in dimethylacetamide.

Process for the preparation of 1,2-bis-(2-nitrophenoxy)-ethane

There is described a process for preparing aromatic polyamides of high hydrolysis resistance by reacting aromatic diamines in a conventional organic solvent and in the presence or absence of inorganic salts wherein the diamine, which has a water content of up to 25% by weight, is dissolved in the organic solvent, which may likewise contain water, and the solution is subjected to a vacuum distillation until the water content of the bottom product is &lt;100 ppm and subsequently the inorganic salts if necessary and then the dicarbonyl dichloride are added in a conventional manner and the condensation reaction is performed and concluded in a conventional manner.

Process for preparing aromatic polyamides of high hydrolysis resistance

8-Oxo-5,6,7,8-tetrahydro-2-quinolone is a novel compound which is prepared by hydrolyzing the hydrochloride of the corresponding 8-chloro compound or the hydrobromide of the corresponding 8-bromo compound to give the corresponding 8-hydroxy compound, and dehydrogenating the latter one.

8-Oxo-5,6,7,8-tetrahydro-2-quinolone and process for the preparation

8-Chloro-5,6,7,8-tetrahydro-2-quinolone and 8-bromo-5,6,7,8-tetrahydro-2-quinolone, the hydrochloride or hydrobromide thereof and their manufacture by reacting 3,4,5,6,7,8-hexahydro-2-quinolone with chlorine or bromine in an inert solvent at 10.degree. to 50.degree. C. with heating of the reaction mixture to 60.degree. to 80.degree. C. after the halogen addition.

8-Chloro-5,6,7,8-tetrahydro-2-quinolone and

N,N'-Diacetylethylene diamine (DAED) is produced by first adding the stoichiometric amount of acetic acid (2 mols per mol of ethylene diamine) at least partially in the form of aqueous acetic acid to ethylene diamine, distilling off in a second step the water contained in the reaction mixture, adding acetic acid in excess to the remaining product, distilling off the aqueous acetic acid formed and recycling it into the first process step. The DAED remains as sump product after distillation of the acetic acid.

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Kelkheim, Germany

Wilfried Pressler