Racemoselective synthesis of...

Details Racemoselective synthesis of... Racemoselective synthesis of...

2006-08-29

2006-08-29

Nazario-Gonzalez, Porfirio (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

C556S012000, C526S160000, C526S943000, C502S103000, C502S117000

Reexamination Certificate

active

07098354

ABSTRACT:
The present invention relates to a specific process for the diastereoselective synthesis of rac-diorganosilylbis(2-methylbenzo[e]indenyl)zirconium compounds of the formula I,by reacting the silyl-bridged bisindenyl ligand with a dihalozirconium bis(3,5-di-tert-butylphenoxide)-base adduct to form the diorganosilylbis(2-methylbenzo[e]indenyl)zirconium bis(3,5-di-tert-butylphenoxide) and subsequently replacing the phenoxide groups by X using suitable replacement reagents to give the compound of the formula I; where the substituents X can be identical or different and are each F, Cl, Br, I or linear, cyclic or branched C1-10-alkyl; and the substituents R can be identical or different and are each linear, cyclic or branched C1-10-alkyl or C6-10-aryl; and also to the use of these compounds as catalysts.

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Damrau et al., Racemo-Selective Synthesis of ansa-Zricocene Derivates from Zirconium Biphenolate Complexes, Nov. 8, 2001, Organometallics, vol. 20, No. 25, pp. 5258-5265.
Rheingold, A. L. et al., “Preparation and Properties of Chiral Titanocene and Zirconocene Dichloride Complexes of a Chrial Ligand”, Organometallics (1992), vol. 11, pp. 1869-1876.

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