Bayer Aktiengesellschaft

Haarmann & Reimer Gmbh

Wolfgang Kiel

Karlfried Wedemeyer

Werner Evertz

Helmut Fiege

Eberhard Zirngiebl

Heinz Ziemann

Josef Pedain

Alexander Klausener

Reinhard Halpaap

Nikolaus Muller

Heinz Landscheidt

Walter Kuhn

Ferdinand Hagedorn

Udo Birkenstock

Josef Kasbauer

Klaus-Christian Paetz

Christian Zwiener

Joerg-Dietrich Jentsch

Hans-Ulrich Funk

Gerhard Senft

Walter Bohm

Helmuth Kritzler

Reductive amination of aldehydes

Methyl cyclohexyl-propionate is prepared by the hydrogenation of methyl cinnamate in the presence of a ruthenium and/or palladium catalyst.

Process for the preparation of methyl cyclohexyl-propionate

Hydroxyethylcyclohexanes which can optionally contain a nitrogen atom in the cyclohexane ring are obtained in a particularly selective manner by catalytic hydrogenation of the corresponding hydroxyethylbenzene or hydroxyethylpyridines when ruthenium which has been treated before use with a reducing agent is used as catalyst.

Process for the preparation of hydroxyethylcyclohexanes and hydroxyethylpiperidines

Amino-halogenophenyl alkyl thioethers prepared in an advantageous manner by catalytic reduction of the corresponding nitro compound by the nitro compound being continuously hydrogenated with hydrogen in the presence of a supported noble-metal catalyst.

Process for the continuous preparation of amino-halo-genophenyl alkyl

Unsubstituted or substituted cyclohexanones are advantageously prepared by hydrogenation of the corresponding phenols in the presence of a palladium-on-carbon catalyst at from 100 to 250.degree. C. and from 1 to 20 bar of hydrogen pressure if the catalyst is mixed with a base component and from 20 to 200% by weight of water (based on the base component) and this mixture is used in the hydrogenation. For identical batches, this gives virtually identical hydrogenation times and virtually equally good yields of cyclohexanones.

Process for preparing cyclohexanones by hydrogenation of the

Substituted or unsubstituted cyclohexanones are advantageously prepared by hydrogenation of the corresponding phenols in the presence of a palladium-on-carbon catalyst at from 100 to 250.degree. C. and from 1 to 20 bar of hydrogen pressure if the reaction is carried out in the presence of straight-chain, branched or cyclic alkanes having a boiling point at atmospheric pressure of over 70.degree. C. as solvents. This makes it possible to obtain substituted or unsubstituted cyclohexanones in short hydrogenation times and in high yields using low-toxicity, physically problem-free solvents which are easy to handle from a safety point of view.

Quinazoline-2,4-diones are obtained in high yields and purities by reacting anthranilic acids with isocyanates and then, without isolation of the urea formed as intermediate, treating the reaction mixture with acid.

Process for the preparation of quinazoline-2,4-diones

Substituted cyclohexanones of the formula ##STR1## where R.sup.1 to R.sup.5 are as defined in the description, can be obtained by catalytic hydrogenation of phenols of the formula ##STR2## where R.sup.1 to R.sup.5 are as defined in the description. The reaction is carried out at from 20.degree. to 250.degree. C., from 1 to 200 bar and in an ether as solvent. If desired, an alkaline alkali metal, alkaline earth metal or ammonium compound is used as additive.

Process for preparing substituted cyclohexanones

2-Amino-6-chlorophenyl-alkylsulfanes are prepared in a particularly advantageous manner by hydrogenating 2-chloro-6-nitrophenyl-alkylsulfanes catalytically in the presence of a solvent without the addition of a further sulfur compound, and the novel compound 2-amino-6-chlorophenyl-isopropylsulfane is provided.

Process for the preparation of 2-amino-6-chlorophenyl-alkylsulfanes, and

Novel ruthenium catalysts additionally contain carbonates, hydroxides and/or hydrated oxides of cerium and manganese or of manganese and/or dehydration products thereof. They can optionally be present on a support material and can be prepared by converting soluble compounds of ruthenium, cerium and manganese by treatment with alkaline compounds into insoluble compounds and optionally further treating these. Such catalysts are particularly suitable for the preparation of cycloaliphatic polyamines by hydrogenation of corresponding aromatic amines.

Ruthenium catalysts, their preparation and a process for preparing

A process for the preparation of coatings using a coating composition having a binder containing a two-component system of a) a polyisocyanate component and b) an isocyanate-reactive component b) which is essentially free from hydroxyl groups and contains b1) 5 to 95 parts by weight of a polyamine containing ester groups and secondary amino groups and b2) 5 to 95 parts by weight of polyketimines.

Process for the preparation of coatings

Bis- and tris-(3-dimethylaminopropyl)-amine can be prepared by catalytic hydrogenation of 3-(dimethylamino)-propionitrile with a palladium catalyst on an Al.sub.2 O.sub.3 -containing support.

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

Reaction products of oxo compounds and amines or ammonia, in which at least one substituent is aromatic and monosubstituted to trisubstituted by halogen, can be catalytically hydrogenated to the respective amines, the halogen essentially being completely retained if an Ni-containing or Co-containing catalyst is employed and the reaction is carried out in the presence of organic sulphur compounds.

Process for the preparation of amines

The catalytic hydrogenation of .alpha.,.beta.-unsaturated ketones of the formula

Process for the hydrogenation of .alpha.,.beta.-unsaturated ketones

Analines, meta-substituted by chlorine are prepared by reacting chloro-anilines having the formula ##STR1## wherein X.sup.1 and X.sup.2 are the same or different and represent chlorine, hydrogen or optionally substituted alkyl, aryl, aralkyl, alkoxy or aralkoxy, with one of the radicals X.sup.1 or X.sup.2 representing chlorine when 3-chloroanilines are being prepared and

Growing community of inventors

Odenthal, Germany

Wolfgang Kiel