Patent ID: 6198002
Filing Date: 2001-03-06
Classification: C07C

Abstract:
A process for preparing a secondary or tertiary 2-methyl-1,5-pentanediamine of the formula I ##STR5##whereR.sup.1 and R.sup.2 are H, C.sub.1 -C.sub.20 -alkyl, C.sub.3 -C.sub.8 -cycloalkyl, aryl, C.sub.7 -C.sub.20 -arylalkyl,where the radicals R.sup.1 and R.sup.2 may bear substituents selected from the group consisting of C.sub.1 -C.sub.20 -alkyl, C.sub.1 -C.sub.20 -alkoxy, C.sub.6 -C.sub.20 -aryloxy and hydroxy, and R.sup.1 and R.sup.2 are not simultaneously hydrogen,orR.sup.1 and R.sup.2 are together an unsubstituted or C.sub.1 -C.sub.20 -alkyl- and/or C.sub.1 -C.sub.20 -alkoxy-substituted C.sub.3 -C.sub.7 -alkylene chain which may, if desired, be interrupted by one or two O or NR.sup.3 groups, whereR.sup.3 is H or C.sub.1 -C.sub.20 -alkyl which comprises reacting 2-methylglutarodinitrile with a primary or secondary amine of the formula R.sup.1 R.sup.2 NH and hydrogen at from 50 to 250.degree. C. and pressures of from 0.5 to 35 MPa in the presence of an oxidic supported catalyst comprising one or more noble metals which has been treated with hydrogen at from 50 to 300.degree. C. for at least 0.5 hour before use.