Clariant Corporation

Hoechst Aktiengesellschaft

Sabic Innovative Plastics IP B.v.

Aventis Research & Technologies Gmbh & Co Kg

Thomas Wessel

Ralf Pfirmann

Peter Koch

Berthold Schiemenz

Robert Edgar Colborn

David Bruce Hall

Wolfgang Appel

Thomas Schach

Sergej Pasenok

Prashant Anil Tatake

John E Pace

Shyamal Bhaskar Gondkar

Kwang Woong Won

Bernd Volker Demuth

Hans H Schubert

Daniel Decker

Karl E Mack

Utpal Mahendra Vakil

Joachim Ritzer

Uptal Mahendra Vakil

Walter Hahn

Andreas Beck

Maren Gutermuth

KarlErnst Mack

Stefan Brand

Lars Bierer

A method of preparing a halophthalic acid is disclosed which comprises the steps of contacting in a liquid phase reaction mixture at least one halogen-substituted ortho-xylene with oxygen and acetic acid at a temperature in a range between about 120&#xb0; C. and about 220&#xb0; C. in the presence of a catalyst system yielding a product mixture comprising less than 10 percent halogen-substituted ortho-xylene starting material, a halophthalic acid product, and less than about 10,000 ppm halobenzoic acid and less than about 1000 ppm halophthalide by-products based on a total amount of halophthalic acid present in the product mixture. In addition methods for the preparation of halophthalic anhydride, and recovery of high purity acetic acid from an aqueous acetic acid stream comprising HCl, which is generated during the preparation of the halophthalic acid are also disclosed.

Method of making halophthalic acids and halophthalic anhydrides

A process for preparing 1,3-di-halo-substituted benzene derivatives (II) from 2,6-di-halo-substituted benzaldehydes (I) (where X, Xare each independently F, Cl, Br, and R, R, Rare each independently H, halogen, OH, C&#x2013;C-alkyl, CF, CHO, C&#x2013;C-aryl, Oalkyl, Oaryl, NO) by reacting with an alkaline medium, which comprises initially charging the alkaline medium and metering in the 2,6-di-halo-substituted benzaldehyde (I) or initially charging the 2,6-di-halo-substituted benzaldehyde (I) and metering in the alkaline medium 

Preparation of 1,3-di-halo-substituted benzene derivatives

The present invention relates to a process for preparing substituted benzoyl chlorides of the formula (1)where R, x and y have the meaning given below, which comprises reacting a benzaldehyde of the formula (2)where R, independently of each other, is identical or different and is an unsubstituted phenyl radical or a phenyl radical that is substituted by halogen, NO, CN, (C-C)alkyl or (C-C)alkoxy, or is halogen, NO, CN, NR', OR&#x2032;, SOR&#x2032;, SOOR&#x2032;, COR&#x2032; or COR&#x2032;, where R&#x2032; is an unbranched or branched C-Calkyl radical, an unsubstituted phenyl radical or a phenyl radical which is substituted by halogen, NO, CN, (C-C)alkyl or (C-C)alkoxy, x is 1 or 2 and y is 1, 2 or 3, with a chlorinating agent in the presence of a free-radical initiator and a solvent at from &#x2212;20 to +200&#xb0; C.

Process for preparing substituted benzoyl chlorides

Aminophosphonium compounds

Mixtures comprising tetrakis(pyrrolidino/piperdino)phosphonium salts

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

Method for producing compounds containing fluorine, in particular

The invention relates to a process for the preparation of fluorinated compounds

Process for the preparation of fluorinated aromatic compounds

Catalyst comprising an amidophosphonium salt for halex reactions

The present invention relates to a process for preparing 4,5-dichloro-2-methylbenzoic acid and also its salts in high yields and in high purities by reacting 3,4-dichlorotoluene with acetyl chloride or chloroacetyl chloride in the presence of a Friedel-Crafts catalyst and subsequently oxidizing the acetylated intermediate to give the carboxylic acid.

Process for preparing 4, 5-dichloro-2-methylbenzoic acid

The present invention relates to a process for preparing ortho-nitrobenzonitriles of the formula I, ##STR1## where R.sup.1 and R.sup.2 are as defined in claim 1, by reacting the corresponding ortho-fluoronitrobenzenes with alkali metal cyanides or cyanide-donating substances in the presence of phase transfer catalysts.

Process for preparing ortho-nitrobenzonitriles

The present invention relates to a process for preparing 4-bromophenyl alkyl ethers by reacting phenyl alkyl ethers with bromine in a water-miscible solvent in the presence of an oxidizing agent which is able to oxidize hydrogen bromide to bromine.

Process for preparing 4-bromophenyl alkyl ethers

Growing community of inventors

Niederdorfelden, Germany

Thomas Wessel