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

• Main Author: JENDRALLA, JOACHIM-HEINER
• Format: Patent
• Language: English; French
• Published: 25.10.1997
• Edition: 7
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; APPARATUS THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; GENERAL METHODS OF ORGANIC CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

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. I II Ia: X= P(R1)2 Ib: X= H