Citation:
ZHANG Yu-Liang, QIAN Ming-Xing, HE Ren. Ethylene Oligomerization Catalyzed by Transition Metal Complexes[J]. Chinese Journal of Applied Chemistry,
;2001, 18(5): 360-364.
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Recent achievements in ethylene oligomerization by using transition metal complexes as catalysts are reviewed with emphases on the description of novel catalyst systems. The relationship between the behavior of catalysts in oligomerization and polymerization has been discussed. The oligomerization and polymerization of ethylene have readily identifiable mechanistic feature, difference is the rate of insertion and U-H elimination. M4+ (M=Ti,Zr) complexes mainly catalyze ethylene oligomerization, and M3+ (M=Ti,Zr) complexes catalyze polymerization. Altering the cocatalyst composition of group Ⅳ B metallocene catalyst systems and reaction conditions leads to oligomerization of ethylene. Group Ⅷ complexes with small volume of ligands favor the U-H elimination and oligomerization.
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