Basf Aktiengesellschaft

Bayer Aktiengesellschaft

Michael Hullmann

Hans-Josef Buysch

Wolfgang Siegel

Joachim Paust

Walter Dobler

Heinz-Josef Kneuper

Frank-Friedrich Pape

Lothar Karrer

Friedhelm Balkenhohl

Peter Eckes

Rainer Becker

Karl-Erwin Piejko

Lothar Puppe

Bruno Bomer

Peter Weidlich

Ulrich Kohler

Preparation of aromatic or heteroaromatic nitrites of the formula I ##STR1## where X is nitrogen or C-R.sup.6 and all of the R substituents represent hydrogen, alkyl, halogen, nitro, amino or similar groups, provided at least one substituent is a cyano or alkylcyano group. The nitrites I are produced by reacting aromatic or heteroaromatic hydrocarbons of the formula II ##STR2## where X is nitrogen or C-R.sup.6, provided at least one substituent is C.sub.1 -C.sub.8 -alkyl, with ammonia and oxygen at 200 to 600.degree. C. under a pressure of 0.1 to 5 bar in the gas phase over a supported catalyst containing 0.5 to 20% by weight of vanadium oxide. The supported catalyst consists of from 2 to 30 particle fractions whose mean diameters differ by from 10 to 80% and the supporting carrier of the catalyst has a bulk density of 0.6 to 1.2 kg/liter.

Preparation of aromatic or heteroaromatic nitriles

Supported catalysts which are suitable for ammonoxidation, comprising

Supported catalysts which are suitable for ammonoxidation

A process for preparing R/S-.gamma.-lipoic acid of the formula I or R/S-.alpha.-lipoic acid of the formula II ##STR1## is disclosed.

Preparation of R/S-.gamma.-lipoic acid or R/S-.alpha.-lipoic acid

A process for separating from each other aniline and aniline derivatives having different numbers of C atoms bound to the N atoms is disclosed herein, this process being characterized in that a mixture of the substances mentioned is treated in liquid phase with zeolites of the faujasite type at a temperature from 0.degree. C. to 190.degree. C.

Process for separating aniline derivatives

Process for the preparation of aliphatic polycarbonates by polymerizing cyclic aliphatic carbonates in the presence of initiators and/or catalysts, in which the initiators used are alkoxy silanes of the formula ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 independently of one another represent a C.sub.1 -C.sub.4 -alkyl radical, n is an interger from 1 to 6 and

Process for the preparation of aliphatic polycarbonates with alkoxy

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Heppenheim, Germany

Michael Hullmann