| abstract |
This invention provides a novel diphosphine compoundnwhich is useful as a ligand of catalysts for asymmetric synthesisnreactions, particularly asymmetric hydrogenation reaction.nParticularly, it provides a diphosphine compound representednby a general formula (1) :n nwherein R 1 and R 2 each independently represents a cycloalkylngroup, an unsubstituted or substituted phenyl group or anfive-membered aromatic heterocycle residue. |