Also described herein is the synthesis of {HEAD ~ linear α olefins} by the oligomerization of ethylene using as a catalyst system a combination a nickel compound having a selected α diimine ligand and a selected Lewis or Bronsted acid, or by contacting {TAIL ~ selected α diimine nickel complexes} with ethylene 
by contacting
Also described herein is the synthesis of { HEAD ~ linear α olefins } by the oligomerization of ethylene using as a catalyst system a combination a nickel compound having a selected α diimine ligand and a selected Lewis or Bronsted acid , or by contacting { TAIL ~ selected α diimine nickel complexes } with ethylene
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH