Bayer Aktiengesellschaft

Bayeraktiengesellschaft

Paul Fiedler

Rudolf Braden

Hartmuth Buding

Joachim Thormer

Thomas Himmler

Heinrich Konigshofen

Martin Littmann

Gerd Siekmann

Manfred Lenthe

Achim Noak

A process for making the known fungicide intermediate 2-(4-chlorophenyl ethyl)-2-tert.-butyloxirane of the formula ##STR1## comprising (a) mixing a solution of trimethylsulphonium bromide of the formula

Process for the preparation of

The selective hydrogenation of unsaturated compounds which carry reducible groups containing nitrogen succeeds in a homogeneous phase with the preservation of the reducible groups containing nitrogen, characterized in that a compound of the formula

Process for the selective hydrogenation of unsatuated compounds

Carbon-carbon double bonds are hydrogenated selectively in a compound containing a reducible, nitrogen-containing group if the hydrogenation is carried out in the presence of a ruthenium complex catalyst. Also disclosed are new ruthenium complexes for use in such selective hydrogenation.

Process for selective hydrogenation of C--C double bonds in the presence

Unsaturated polymers containing nitrile groups can be hydrogenated with the preservation of the nitrile group in a homogeneous phase with a catalyst of the formula:

Process for the selective hydrogenation of unsaturated polymers

The selective hydrogenation in a homogeneous phase of unsaturated compounds carrying reducible groups containing nitrogen so as to preserve the reducible groups containing nitrogen succeeds with excellent yields if a compound corresponding to the following general formula:

Process for the selective hydrogenation of unsaturated compounds

Process for selective hydrogenation of C-C double bonds in the presence

Nitrile group-containing polymers are hydrogenated in a homogeneous phase with preservation of the nitrile groups in a low molecular weight ketone as a solvent and with a compound corresponding to formula

Hydrogenation of nitrile group-containing unsaturated polymers

Aryl halides are formylated with carbon monoxide and hydrogen in the presence of a noble metal catalyst, tertiary organic nitrogen compounds and phosphanes or phosphites.

Process for formylating aryl halides

3-Aminomethyl-1-(3-aminopropyl-1-methyl)-4-methylcyclohexane and a process for the preparation of this new compound, which uses limonene and/or monohydroformylation products of limonene as starting substances and proceeds via a dihydroformylation product of limonene. The new compound is useful as a corrosion inhibitor, as a crosslinking agent for epoxide resins and as a chain lengthening agent for NCO prepolymers.

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Cologne, Germany

Paul Fiedler