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Bis(8-quinolinolato)zirconium dichloride (Ox)2ZrCl2 (Ox- = 8-quinolinolato) was foundactive for ethylene oligomerization with a high selectivity of 84~94% to C4~C10 olefins at70~100℃ under the pressure of 1.8 MPa using Et2AlCl as a co-catalyst (Al/Zr = 60).