Preparation of diamines

US5557011A · kind A · utility

Assignee

• BASF SE

Inventors

• Tom Witzel · Ludwigshafen, DE
• Eberhard Fuchs · Bischofswerda, DE

Key dates

• Filing date: Nov 15, 1994
• Grant date: Sep 17, 1996
• Expiry date: Nov 15, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/48
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the preparation of diamines of the general formula I ##STR1## in which A denotes a C.sub.1 -C.sub.20 alkylene chain optionally mono- to penta-substituted by C.sub.1 -C.sub.4 alkyl, PA0 R.sup.1, R.sup.2 denote C.sub.1 -C.sub.20 alkyl, C.sub.1 -C.sub.20 hydroxyalkyl, C.sub.3 -C.sub.8 cycloalkyl, C.sub.4 -C.sub.20 alkylcycloalkyl, C.sub.4 -C.sub.20 cycloalkylalkyl, phenyl, C.sub.7 -C.sub.20 phenylalkyl, C.sub.1 -C.sub.20 alkoxyalkyl, C.sub.7 -C.sub.20 phenoxyalkyl or together a saturated or unsaturated C.sub.2 -C.sub.6 alkylene chain optionally monosubstituted, disubstituted, or trisubstituted by C.sub.1 -C.sub.4 alkyl and optionally interrupted by oxygen or nitrogen, by the reaction of dinitriles of the general formula II EQU NC--A--CN (II), in which A has the aforementioned meaning, with secondary amines of the general formula II ##STR2## in which R.sup.1 and R.sup.2 have the aforementioned meanings, with hydrogen at temperatures ranging from 50.degree. to 200.degree. C. and pressures ranging from 5 to 300 bar in the presence of a hydrogenation catalyst, in which a palladium catalyst on an oxidic support is used as hydrogenation catalyst.