| abstract |
A process comprising: contacting 1) ethylene, 2) a catalytic system comprising a chromium component comprising a complex of chromium compound N2-phosphinyl formamidine, a complex of chromium compound N2-phosphinylformamidine, a complex of compound of chromium N2-phosphinylguanidine or any combination thereof, and an aluminoxane, 3) an organic reaction medium, and 4) optionally hydrogen; and forming an oligomeric product in a reaction zone; wherein the ethylene is contacted with at least a portion of the organic reaction medium to form an ethylene feedstock mixture prior to contacting the ethylene with the catalyst system. |