Also disclosed herein is a process for the production of {HEAD ~ linear alpha olefins} by contacting ethylene with a nickel compound of the formula DAB!NiX2 wherein DAB is a selected α diimine and X is chlorine, bromine, iodine or alkyl, and a selected Lewis or Bronsted acid, or by contacting {TAIL ~ ethylene} with other selected α diimine nickel complexes 
by contacting
Also disclosed herein is a process for the production of { HEAD ~ linear alpha olefins } by contacting ethylene with a nickel compound of the formula DAB!NiX2 wherein DAB is a selected α diimine and X is chlorine , bromine , iodine or alkyl , and a selected Lewis or Bronsted acid , or by contacting { TAIL ~ ethylene } with other selected α diimine nickel complexes
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