Importance

Loading Importance Indicators...

Abstract

A process for the preparation of primary or secondary amines by hydrogenation of imines with hydrogen at elevated pressure and in the presence of a dinuclear Ir(III) complex having ditertiary diphosphine ligands, halide bridges, halide and hydride ligands, or an Ir(III) halide complex salt containing ditertiary diphosphine ligands, as catalyst, wherein the catalyst corresponds to formula I or Ia or to mixtures of at least two compounds of formula I, at least two compounds of formulae I and Ia, or at least two compounds of formula Ia [(DIP)IrX.sub.q Y.sub.r ].sub.2 (I), [(DIP)X.sub.4 ].sup..crclbar. Me.sup..sym. (Ia), wherein DIP is the ditertiary diphosphine ligand of a ferrocenyldiphosphine the phosphine groups of which are either bonded directly or via a bridge group --CR.sub.v R.sub.w -- to the ortho positions of a cyclopentadienyl ring or are each bonded to a cyclopentadienyl ring of a ferrocenyl, so that a 5-, 6- or 7-membered ring is formed together with the Ir atom; R.sub.v and R.sub.w are each independently of the other hydrogen, C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.4 fluoroalkyl, phenyl or benzyl, or are phenyl or benzyl each having from 1 to 3 C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 -alkoxy substituents; X is Cl, Br or I; Y is H; q is a number 2 or 3 and r is 0 or 1, the sum of q+r being equal to 3; and Me.sup..sym. is an alkali metal cation or quaternary ammonium.

Loading the Abstract Image...

First Claim