Bayer Aktiengesellschaft

Rhein Chemie Rheinau Gmbh

Friedrich-Wilhelm Ullrich

Helmut Fiege

Heinz U Blank

Willi Streicher

Erich Wolters

Gerhard Marzolph

Ludger Heiliger

Josef Kasbauer

Karlheinrich Meisel

Wolfgang Eymann

Volker Glock

Gunther Klag

Gunter Silber

Dieter Irmscher

Nikolaus Schulz

Rudiger Herpich

Halmut Kraus

Method for preparing 2-nitro-5-(phenylthio)-anilines

The invention relates to a particularly advantageous method for producing aryl thiols through the catalytic hydrogenation of diaryldisulphides. According to the invention, the hydrogenation is carried out in a basic alcoholic medium.

Method for producing aryl thiols by hydrogenating diaryldisulphides

The invention relates to novel S-(4-biphenyl)-thiosulfuric acids and their salts, to a method for producing them from S-(4-biphenyl)-thiosulfinic acids and their salts, and to a method for producing 4-mercaptobiphenyls from the S-(4-biphenyl)-thiosulfuric acids and their salts.

S-(4-biphenyl)-thiosulphuric acids and their salts, method for producing the same and method for producing 4-mercaptobiphenyls

Aromatic maleimides can be prepared by reacting corresponding aromatic amines with maleic anhydride in the presence of a solvent mixture of halogenated hydrocarbon and a dipolar aprotic solvent, with the addition of acid and a polymerization inhibitor.

Process for the preparation of aromatic maleimides

Indoles of the formula ##STR1## can be prepared by reaction of a phenylhydrazine of the formula ##STR2## which is unsubstituted in at least one ortho-position, with a ketone of the formula ##STR3## in an aqueous medium in the presence of an acid compound, less than 5 equivalents, based on 1 mol of phenylhydrazine, of an acid compound having a pK value of 1.3-4.5 being employed.

Process for the preparation of indoles

.beta.-Amino-acrylic acid esters of the formula

Process for the preparation of .mu.-amino-acrylic acid esters

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Bergisch Gladbach, Germany

Friedrich-Wilhelm Ullrich