processo para a racemizaÇço de compostos atropisomÉricos,seu uso e processo para a fabricaÇço de complexos de metal de transiÇço opticamente ativos

The present invention is concerned with a novel process for the racemization of atropisomeric bis(phosphine oxide) compounds of formula I in their (S) or (R) or non-racemic form, for the preparation of optical active bisphosphine ligands, which form optical active complexes with transition metals. These complexes are used as catalysts in a number of asymmetric reactions. The racemization is thermal and carried out in high or low boiling solvent, under normal or elevated pressure at 10 to 3.5x10 Pa. The heating is performed in a system which allows heating up to 400 DEG C (reactor, autoclave, aluminum block, round-bottom flask with heating/stirring mantle and the like) or by microwave irradiation or in the melt at a temperature from 260 to 400 DEG C, preferably from 280 to 380 DEG C, batchwise or in a continuous manner.