| 摘要 |
Novel hydridotris(pyrazolyl)borate complexes of Group 4 metals of the Periodic Table of the Elements are coordination polymerization catalysts. The complexes are of the formula HY'M'X'n'X3 (I) or ¢HY'M'X'n'X2!+ A (II) wherein: HY is a hydroidotris(pyrazolyl)borate ion in which the pyrazolyl group can be substituted by, for example, C1-C6 alkyl; M is a Group 4 metal, especially titanium or zirconium; each X is an inert anionic ligand, especially OR in formula I and R in formula II, wherein H is phenyl or C1-C6 alkyl or cycloalky; X' is an inert neutral donar ligand; n i3 0 or 1, preferably 0; and A- is a noncoordinating, compatible anion of a Bronsted acid salt. 39,230-F When the complex is of formula I, it is preferably used with an aluminum compound containing AlO, Al-N or Al-P bonds, especially an alkylaluminoxane, and, optionally, a tri(C1-C6 alkyl)aluminum compound. 39,230-F
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