Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Patent
1994-03-14
1996-04-02
Wu, David W.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
556 7, 556 12, 556 18, 556 20, 556 28, 556 53, 556 54, 556 56, 556 11, 502155, 526126, 526170, C07F 708
Patent
active
055042244
ABSTRACT:
Bridged monocyclopentadienyl derivatives of a Group 4 metal are prepared by contacting a corresponding bis(cyclopentadienyl) metal complex with an alkali metal derivative or alkaline earth metal derivative of a hydrocarbyl ligand R, which is optionally substituted with one or more amino, phosphino, ether, thioether, or silyl groups. The bis(cyclopentadienyl) Group 4 metal complexes can be prepared by contacting a compound corresponding to one of the formulas (Cp).sub.3 MQ.sub.n X.sub.t, (Cp).sub.2 MQ.sub.n X.sub.t+1, or CpMQ.sub.n X.sub.t+2 and a dianionic salt compound corresponding to the formula: (L.sup.+x).sub.y (Cp*-Z-Y).sup.-2 or ((LX').sup.+x).sub.y (Cp*-Z-Y).sup.-2. An addition polymerization catalyst comprising a bis(cyclopentadienyl) Group 4 metal complex and an activating cocatalyst, and an addition polymerization process using such a catalyst.
REFERENCES:
patent: 5026798 (1991-06-01), Canich
Dormond et al. Journal Organometal Chemistry, 110, pp. 321-326 (1976).
Organometallics, 12, pp. 1936-1945 (1993).
Organometallics, 10, pp. 2665-2671 (1991).
The Dow Chemical Company
Wu David W.
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