Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Reexamination Certificate
2000-03-10
2001-09-04
Nazario-Gonzalez, Porfirio (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
C556S027000, C556S053000, C526S161000, C526S177000, C526S178000, C526S186000, C526S188000, C526S189000, C526S198000, C526S348000, C526S943000, C502S103000, C502S117000, C502S120000
Reexamination Certificate
active
06284905
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to certain bridged Group 4 transition metal complexes possessing a unique bridging structure and to olefin polymerization catalysts obtained from such complexes. In one form, this invention embodies Group 4 transition metal complexes containing a unique bridged, or divalent ligand structure having two anionic, delocalized &pgr;-bonded ligands attached thereto. In a second embodiment the invention relates to Group 4 transition metal complexes containing a unique bridged ligand containing one of the foregoing anionic, delocalized &pgr;-bonded moieties and one anionic amido or phosphido moiety. In a third embodiment the invention relates to Group 4 transition metal complexes containing a unique bridged ligand containing two anionic amido and/ or phosphido groups. In all cases the unique bridge consists of either boron or aluminum atoms which are further ligated with nitrogen containing groups.
In
Angew. Chem. Int. Ed. Enal.,
36, 21, p2338-2340 (1997) and in
Phosphorus, Sulfur, and Silicon,
124 & 125, p561-565 (1997) amido substituted boron bridged ferrocenophanes useful for forming poly(ferrocenes) by a ring opening polymerization were disclosed. The synthesis and characterization of Group 1 and 2 metal and tin complexes of 1,2-bis(dimethylamino)-1,2-di-9-fluorenyldiboranes were disclosed in
Chem. Ber.,
127, p1901-1908, (1994). Diboranes having structure similar to those employed in the foregoing study were disclosed by the same researchers in
Eur. J. Inorg. Chem.,
p505-509 (1998). Ferrocenophane derivatives of similar bisboranes for further molecular property studies were disclosed by
J. Organomet. Chem.,
530 p117-120 (1997). In
Organometallics,
16, p4546-4550 (1997) boron bridged ansa metallocene complexes including dimethylsulfide and phosphine adducts thereof of possible use in Ziegler-Natta-type olefin polymerizations were disclosed.
In the patent literature, bridged metal complexes for use as olefin polymerization catalyst components, including such complexes containing one or more boron atoms in the bridge are generically disclosed by EP-A-416,815 and WO 98/39369.
REFERENCES:
patent: 5399636 (1995-03-01), Alt et al.
Journal of Organometallic Chemistry, Preparation of some organo-bis(diisopropylamino)boranes and their application to the synthesis of oxazaborolidines, 455, (1993), pp. 37-46.
Inst. For Inorganic Chemistry, Munich Univ., Preparation of dimethylamino-diboron chlorides, B2(Nme2)4-nCln2, Noth et al. 714-718, 1962.
Ashe, III Arthur J.
Devore David D.
Fang Xinggao
Frazier Kevin A.
Green D. Patrick
Nazario-Gonzalez Porfirio
The Dow Chemical Company
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