General Electric Company

Hoechst Aktiengesellschaft

Cassella Aktiengesellschaft

Sabic Innovative Plastics IP B.v.

Allessa Gmbh

Peter Koch

Robert Edgar Colborn

David Bruce Hall

Thomas Wessel

Gerald Oeckel

Willi Steckelberg

Prashant Anil Tatake

John E Pace

Shyamal Bhaskar Gondkar

Kwang Woong Won

Bernd Volker Demuth

Wolfgang Bauer

Rolf Muller

Karl E Mack

Johannes Becherer

Utpal Mahendra Vakil

Uptal Mahendra Vakil

Manfred Krattenmacher

KarlErnst Mack

A method is described for immediately terminating free radical polymerizations by adding an inhibitor solution comprising a phenothiazine compound and/or a monoalkyl ether of hydroquinone to the free radical polymerizing system. The method is characterized in that the solvent of the inhibitor solution comprises at least 50% by weight of the solvent of alkylene glycol and/or polyalkylene glycol and/or terminally etherified derivatives of alkylene glycol and/or of polyalkylene glycol. The method permits the use of nontoxic inhibitor solutions. Inhibitor solutions are also described which comprise a phenothiazine compound and/or a monoalkyl ether of hydroquinone and, as solvent, alkylene glycol and/or polyalkylene glycol and/or terminally etherified derivatives of these compounds.

Method for immediately terminating radical polymerizations, inhibitor solution, and use thereof

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 method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful in the synthesis of polyetherimide.

Liquid phase oxidation of halogenated ortho-xylenes

A method for the manufacture of chlorophthalic acid by liquid phase oxidation of chloro-ortho-xylene is disclosed. The chlorophthalic acid may be dehydrated to form chlorophthalic anhydride which is useful in the synthesis of polyetherimide.

Method for the manufacture of chlorophthalic anhydride

Method for the manufacture of halophthalic acids and anhydrides

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 processes for preparing 1-methoxy-2-propyl 3-(7-diethylamino-2-oxo-2H-chromen-3-yl)-3-oxopropionate of the formula I ##STR1## and also di(1-methoxy-2-propyl) acetonedicarboxylate as intermediate for one of the processes.

Processes for preparing 1-methoxy-2-propyl

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 the preparation of compounds of the general formula I ##STR1## by reaction of compounds of the general formula II ##STR2## with amines of the general formula III ##STR3## wherein R.sup.1 and R.sup.2 independently of one another denote hydrogen, (C.sub.1 -C.sub.4)-alkyl, C.sub.1 -C.sub.4)-hydroxyalkyl or (C.sub.5 -C.sub.6)-cycloalkyl, or, together with the nitrogen atom carrying them, form (C.sub.4 -C.sub.6)-heterocyclyl and R.sup.3 and R.sup.4 independently of one another denote hydrogen, (C.sub.1 -C.sub.4)-alkyl, (C.sub.1 -C.sub.4)-hydroxyalkyl, (C.sub.1 -C.sub.2)-alkylcarbonyl or tosyl.

Process for the preparation of N-substituted nitro-p-phenylenediamines

The present invention relates to a process for the preparation of N-ethylcarbazole by reaction of carbazole or N-ethoxycarbonylcarbazole with diethyl carbonate.

Process for the preparation of N-ethylcarbazole

The present invention relates to compounds of the general formula I ##STR1## wherein R.sup.1 denotes formyl or (C.sub.1 -C.sub.3)-alkylcarbonyl,

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Frankfurt-am-Main, Germany

Peter Koch