| 摘要 |
2,2'-Disubstituted 1,1'-diphosphino-ferrocenes and 1',2-disubstituted 1-phosphino-ferrocenes, processes for preparing them, their use, and transition metal complexes comprising them The present invention relates to optically active and racemic C2-symmetric 2,2'-disubstituted 1,1'-diphosphino-ferrocenes of the formula la, to optically activeand racemic asymmetric 1',2-disubstituted 1-phosphino-ferrocenes of the formula Ib and to achiral 2,2'-disubstituted 1,1'-diphosphino-ferrocenes of the formula II, to processes for preparing them, especially in accordance with the principle of asymmetric ortho-lithiation, to their use as ligands for transitionmetal complexes, to transition metal complexes comprising them, and to the use of the transition metal complexes as catalysts, especially in asymmetric syntheses. <IMG> I <IMG> II Ia: X= P(R1)2 Ib: X= H
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