Hoechst Aktiengesellschaft

Clariant Corporation

Aventis Research & Technologies Gmbh & Co Kg

Ralf Pfirmann

Theodor Papenfuhs

Thomas Wessel

Stefan Krause

Rainer Wingen

Thomas Schach

Doris Neumann-Grimm

Berthold Schiemenz

Matthias Beller

Hans H Schubert

Holger Geissler

Klaus Forstinger

Heinz Strutz

Wolfgang Appel

Sergej Pasenok

Hartmut Fischer

Laurent Weisse

Joachim Hackenbruch

Georg Folz

Georg Weichselbaumer

Andreas Maier

Walter Hahn

Andreas Beck

Friedrich Seitz

Aminophosphonium compounds

Mixtures comprising tetrakis(pyrrolidino/piperdino)phosphonium salts

Preparation of trifluorobenzoic acids

Process for the preparation of isochroman-3-ones

The present invention relates to a process for the preparation of 3-chloro-4-fluorobenzoyl chloride which comprises reacting 4-fluorobenzaldehyde with a chlorinating agent in the presence of a free-radical initiator in the presence or absence of a solvent at from &minus;20 to 200&deg; C. to give 4-fluorobenzoyl chloride, and reacting the 4-fluorobenzoyl chloride with a chlorinating agent in the presence of a chlorination catalyst in the presence or absence of a solvent at from &minus;20 to 200&deg; C. to give 3-chloro-4-fluorobenzoyl chloride.

Two-step production of 3-chloro-4-fluoro-benzoyl chloride by chlorination

Catalyst comprising an amidophosphonium salt for halex reactions

The present invention relates to a process for preparing an isochroman-3-one of the formula (I) by reacting a 1,2-bishalomethylbenzene of the formula (II) ##STR1## in which X is chlorine, bromine or iodine with carbon monoxide and water at a CO pressure of from 0.1 to 50 MPa and a temperature of from 20 to 200.degree. C. in the presence or absence of an ionic halide, in the presence of a palladium catalyst and a dipolar aprotic solvent, where in the formulae (I) and (II) the radicals R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another denote:

Process for preparing isochroman-3-ones

Process for producing quinazoline derivatives

Monoesters of carboxymethylene anthranilic acids and process for

The present invention relates to a process for the preparation of 3,5-difluoroaniline by reacting 3,5-difluorochlorobenzene with ammonia in the presence of a solvent in the presence of a copper compound and at least one metal selected from the group consisting of copper, iron, cobalt, nickel, chromium, molybdenum and zinc, at 100 to 250.degree. C.

Process for the preparation of 3,5-difluoroaniline

Process for preparing N-carboxymethylene-4-chloro-anthranilic acid and

The present invention relates to a process for the preparation of compounds of the formula (1)

Process for the preparation of esters of aromatic carboxylic acid

The present invention relates to compounds of the formula (1) ##STR1## where R is H, a straight-chain or branched alkyl radical with 1 to 6 carbons, a fluorinated straight-chain or branched alkyl radical with 1 to 6 carbons, a benzyl radical, or a benzyl radical substituted by an alkyl group or alkoxy group with 1 to 4 carbons each, or by halogen, X is H, Cl, Br or I, and X is different from R, and a process for their preparation.

Derivatives of 2, 3, 6-trifluorophenols and a process for their

Process for the preparation of fluorine-containing compounds by reduction in a container provided with a stirrer, the stirrer being constructed entirely or partly of a carbon material.

Process for the preparation of fluorine-containing chemical compounds

Growing community of inventors

Griesheim, Germany

Ralf Pfirmann