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Synthesis of Mixed‐ring Zirconocene Complexes Containing Alkenyl Group and Ethylene Polymerization Catalyzed with Them
Author(s) -
YanLong Qian,
XianMiao Qian,
JiLing Huang,
JunQuan Sun
Publication year - 2003
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20030210325
Subject(s) - methylaluminoxane , chemistry , polymerization , catalysis , ethylene , polymer chemistry , zirconium , metallocene , medicinal chemistry , solvent , ligand (biochemistry) , organic chemistry , polymer , biochemistry , receptor
Four new mixed‐ring zirconium completes, [CH 2 = CH(CH 2 ) n ‐C 5 H 4 ](RC 5 H 4 )ZrCl 2 [n = l, R = CH 3 OCH 2 CH 2 (3); n = 2, R = CH 3 OCH 2 CH 2 (4); n = 2, R=Me 3 Si (5); n = 2, R = allyl (6)], have been prepared by the reaction of CH 2 = CH(CH 2 ) n C 5 H 4 ZrCl 3 , DME[ n = l (1); n = 2 (2)] with RC 5 H 4 Li. When activated with methylaluminoxane (MAO), the catalytic activities of the above complexes in ethylene polymerization were tested. Complexes 5 and 6 show high activities similar to Cp 2 ZrCl 2 . Introduction of methoxyethyl group into Cp‐ligand dramatically decreases the catalytic activities of complexes 3 and 4, which can be overcome by increasing the amount of MAO. For complex 5, the dependence of activity and molecular weight ( M η) on the Al/Zr ratio, the polymerization time ( t P ), polymerization temperature ( T P ) and the polymerization solvent volume (V) was investigated.