Bayer Aktiengesellschaft

Bayer Corporation

Henry Giera

Horst Berneth

Michaela Meiers

Hilmar Bischoff

Pieter Ooms

Delf Schmidt

Joachim Schuhmacher

Rolf Angerbauer

Carsten Schmeck

Gunter Schmidt

Klaus-Dieter Bremm

Michael Schelhaas

Carl Casser

Paul Naab

Walter Lange

Holger Paulsen

Arndt Brandes

Christian Laue

Adolf Sicheneder

Michael Conrad

Felix Reichel

Uwe Hugger

Torsten Pohl

Manfred Jautelat

Jurgen Stoltefuss

Dietmar Bielefeldt

Matthias Muller-Gliemann

Karin Hassenruck

Karlheinrich Meisel

Raul Pires

J&uuml;rgen Stoltefuss

Christoph Schild

Hans-Ulrich Siegmund

Michael L&ouml;gers

Joachim Haider

Gerhard Arnold Braun

Alison J Murray

Adolf Brill

Fred Schuhmacher

Matthias M&uuml;ller-Gliemann

Karl Lange

Process for preparing 4-aminodiphenylamine

The present invention relates to the production of aminodiphenyl-amines resulting in good yields and high purity levels when aromatic amines are reacted with nitrohalobenzenes in the presence of a palladium catalyst and a base and the product thus obtained is subsequently hydrogenated with hydrogen.

Process for producing aminodiphenylamines

The invention relates to a process for the preparation of nitrosobenzenes from aromatic amines by oxidation with hydrogen peroxide in the presence of sodium molybdate dihydrate and an inert organic solvent.

Process for the preparation of nitrosobenzenes

The invention relates to a process for the preparation of nitrosobenzene from aromatic amines by oxidation with hydrogen peroxide in the presence of a catalyst based on compounds of tungsten and/or molybdenum without the addition of the organic solvents conventionally used.

The invention relates to a process for the preparation of nitrodiphenylamines by reaction of nitrohalogenobenzenes with aromatic amines in the presence of a palladium catalyst and a base, the base being ground and/or dried before its use.

Process for the preparation of nitrodiphenylamines

The cycloalkano-pyridines are prepared by reacting corresponding cycloalkano-pyridine-aldehydes with suitable organometallic compounds or Wittig or Grignard reagents or reacting compounds of the cycloalkano-pyridine alcohols type with suitable bromine compounds, and optionally varying the functional groups accordingly. The cycloalkanopyridines are suitable as active compounds in medicaments, in particular in medicaments for the treatment of hypertipoproteinaemia and arteriosclerosis.

Cycloalkano-pyridines

The present invention provides a process for preparing (4-nitroso-phenyl)phenyl-hydroxylamine which is characterized in that nitrobenzene is reacted in the presence of hydroxide and/or oxide-containing bases, optionally in the presence of solvents, at temperatures of 20 to 180.degree. C. and pressures of 0.1 to 10 bar. The process according to the invention has the particular advantage that it uses inexpensive and cost-effective nitrobenzene as starting material instead of the nitrosobenzene conventionally used hitherto.

Process for preparing (4-nitro-sophenyl)phenylhydroxylamine

The cycloalkano-pyridines are prepared by reacting corresponding cycloalkano-pyridine-aldehydes with suitable organometallic compounds or Wittig or Grignard reagents or reacting compounds of the cycloalkano-pyridine alcohols type with suitable bromine compounds, and optionally varying the functional groups accordingly. The, cycloalkanopyridines are suitable as active compounds in medicaments, in particular in medicaments for the treatment of hyperlipoproteinaemia and arteriosclerosis.

Method for reducing the toxicity of spent liquors and novel cationic dyes

A variety of diazacyanine mediators that are soluble in aqueous media and which do not inhibit enzymatic activity are provided for use on the surface of a working electrode of a electrochemical biosensor for electrochemical co-enzyme regeneration. The co-enzyme, dihydronicotinamide adenine dinucleotide (NADH) or dihydronicotinamide adenine dinucleotide phosphate (NADPH), is oxidized to NAD.sup.+ OR NADP.sup.+ which is reduced by an oxidoreductase such as a dehydrogenase acting on a substrate. By applying the mediator together with NADH or NADPH to the surface of the working electrode, the voltage necessary to achieve oxidation is substantially reduced. Biosensor electrodes such as graphite electrodes may be produced-by screen printing techniques.

Electro chemical biosensor containing diazacyanine mediator for

4,5-Dihydro-1H-1,2,3-triazolium compounds of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 independently of one another denote C.sub.6 -C.sub.14 -aryl or a heterocyclic radical having up to 3 rings and up to 4 heteroatoms from the series consisting of O, S and N,

Dyeing or printing process with new and known cationic

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Grosskitzighofen, Germany

Henry Giera