Niederdruck‐Oligomerisation von Mono‐Olefinen mit löslichen Nickel/Aluminium‐Bimetallkatalysatoren Teil III. Reaktionskinetische Untersuchungen über die Dimerisation und Trimerisation des Áthylens

The kinetics of the di‐ and trimerization of ethylen in organic solvents under the influence of a homogeneous catalyst containing π‐tetramethylcyclobutadiene‐nickeldichloride and a prereacted mixture of ethylaluminiumdichloride and tri‐ n ‐butylphosphine are reported. The primary reaction product is 1‐butene, which is isomerized to 2‐butene ( cis / trans ) during the reaction. The C 6 ‐Olefins are formed by the reaction of ethylene with 1‐butene and with the 2‐butenes. The following primary reaction products are obtained: 3‐hexene ( cis / trans ), 1‐hexene, 2‐ethyl‐1‐butene, 3‐methyl‐1‐pentene and 3‐methyl‐2‐pentene ( cis / trans ). The effect of other phosphines on the reaction was also studied. The relative composition of the reaction product is strongly dependent upon the amount and the L EWIS base strength of the phosphine present. The results are in accordance with a coordinative mechanism on nickel.