Inventor

FIEGE HELMUT

DE84 patents

⚠️ This page may combine multiple inventors who share the name “FIEGE HELMUT”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

FIEGE HELMUT

BAYER AG

Process for the preparation of N,N-diaryl-ureas

Process for the ring chlorination of aromatic hydrocarbons

Process for the ring chlorination of aromatic hydrocarbons

Process for preparing 2-cyanoindan-1-ones

Process for the preparation of 2,4-dichloro-5-fluorobenzonitrile and 2,6-dichloro-3-fluorobenzonitrile

Process for the preparation of p-dichlorobenzene

Process for the preparation of 2-chloro-4-nitro-alkylbenzene

Process for the preparation of aldehydes

Process for the removal of m-chlorotoluene from chlorotoluene mixtures

Process for the preparation of 3-phenoxy-benzaldehydes

Process for the preparation of alkylthiomethylphenols and arylthiomethylphenols

Preparation of 2-alkyl- and 2-aryl-thiomethylphenols

Process for the preparation of aryloxyacetic acid

Process for the preparation of o-hydroxy-benzaldehydes

Process for the preparation of bis-and tris-(3-dimethylaminopropyl)amine

Process for the isolation of alkylated aromatic amines

Process are the preparation of p-hydroxy-benzaldehydes

Process for nucleus-chlorination of aromatic hydrocarbons

Process for preparing 1,2-dichlorobenzene

Process for the preparation of hydroxybenzaldehydes

Process for isolating hydroxypivalic acid from aqueous solution

Process for the preparation of 4-fluorothiophenol

Process for preparing m-chloroaromatics

Heat transfer fluid and process for its preparation

Process for the preparation of 2,4- or 2,6-dihalogeno-aniline

Process for the preparation of alkylhydrazine salts

Process for the preparation of dialkyl dicarbonates

Process for decarboxylation of halogenated aromatic carboxylic acids

Process for the preparation of 5-hydroxymethylthiazole

2-(arylimino-methyl)-3-dialkylaminoacrylonitriles, a process for their preparation and their use

Process for the nuclear chlorination of aromatic hydrocarbons

Process for reacting polyhalogenated aromatic compounds with monohalogenated or nonhalogenated aromatic compounds

Process for ring-chlorination of aromatic hydrocarbons

Preparation of phosphoric acid derivatives and intermediates

Process for the preparation of benzothiazepinone derivatives

Process for the preparation of 2,2-bis-chloro-methylalkanecarboxylic acid chlorides

Process for the preparation of oxetane-3-carboxylic acids

Process for the preparation of arylglyoxylic acids

Process for preparing 2-halogenated indan-1-ones

Process for the preparation of 4-hydroxybiphenyl

Process for the preparation of hydroxypivalic acid

Process for the preparation of carbazole

Process for the preparation of (2RS,3RS)-3-(2&#39;-aminophenylthio)-2-hydroxy-3-(4&#34;-methoxyphenyl)-propionic acid methyl ester

Process for the preparation of 2-chloro-6-nitrophenyl alkyl sulphides and novel 2-chloro-6-nitrophenyl alkyl sulphides

Process for desulphurizing organic mercapto and/or disulphide compounds

Process for preparing nitrodiphenyl (thio) ethers

Process for the preparation of a mixture of 2-and 4-hydroxybenzyl alcohol

Process for the preparation of arylglyoxylic acids

Process for preparing 3-fluoro-4,6-dichlorotoluene

HAARMANN & REIMER GMBH

Process for the preparation of pure 2-hydroxybenzyl alcohol, pure 4-hydroxybenzyl alcohol or a mixture of both hydroxy-benzyl alcohols

Process for the preparation of (2RS,3RS)-3-(2'-aminophenylthio)-2-hydroxy-3-(4"-methoxyphenyl)-propionic acid methyl ester