IRIDIUM-DIPHOSPHINE COMPLEXES AND PROCESS FOR THE HYDROGENATION OF IMINES

摘要

PCT No. PCT/EP96/03146 Sec. 371 Date Jan. 22, 1998 Sec. 102(e) Date Jan. 22, 1998 PCT Filed Jul. 17, 1996 PCT Pub. No. WO97/05150 PCT Pub. Date Feb. 13, 1997Compounds of formulae I: (DIP)IrXqYr(Z), Ia: (DIP)IrXsYt(Z)2 and Ib: (DIP)Ir(Z)3 or mixtures of at least two of those compounds, wherein DIP is a ditertiary diphosphine, the two phosphine groups of which are bonded to a C2-, C3- or C4-carbon chain, with the result that the diphosphine forms a 5- to 7-membered ring together with the Ir atom, X is Cl, Br or I, Y is a hydrogen atom, q and r are 0, 1 or 2 and the sum of q+r is 2, s and t are 0 or 1 and the sum of s+t is 1, and Z is the anion of an organic oxy acid that contains a group C(=O), S(=O)O or P(=O)O in the anion. The compounds are excellent catalysts for the hydrogenation of imines, especially for the enantioselective hydrogenation of prochiral imines.