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The catalyst system DPA(Na)/NiCl 2 ·6H 2 O/Zn (DPA(Na), sodium salt of diphenylphosphinoacetic acid has high activity and selectivity to form lower α-olefins in the oligomerization of ethylene. The amount of zinc highly affects the activity, and the Zn 2+ which came from the oxidation of zinc is likely to enhance the selectivity to lower α-olefins. The solvent used in this...