Patent ID: 8829218

Claim:
A chromium complex compound for selective ethylene oligomerization comprising a chiral ligand as represented by Formula 1 or 2 below: wherein R 1 , R 2 , R 3 , and R 4 are each independently hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl, or substituted heterohydrocarbyl; R 5 and R 6 are each independently hydrocarbyl or substituted hydrocarbyl, or R 5 and R 6 are bonded with hydrocarbylene, substituted hydrocarbylene, heterohydrocarbylene or substituted heterohydrocarbylene; X 1 to X 4 are each independently halogen, —OR 21 , —OCOR 22 or —NR 23 R 24 , in which R 21 , R 22 , R 23 or R 24 is hydrogen, hydrocarbyl or heterohydrocarbyl; L is hydrocarbon or heterohydrocarbon; and * and ** are a chiral carbon position and are each independently (S) or (R) configuration.