METHOD OF OLIGOMERIZATION OF OLEFINS

The present invention relates to a method of preparing α-olefins by oligomerization of C2-C4 olefins. The method is carried out by oligomerization of C2-C4 olefins in the presence of a catalyst system comprising a transition metal source, an activator, which is an alkylaluminoxane, and a compound of formula (I), Ar1Ar2P-N(R)-PAr3Ar4 [formula I], wherein Ar1-4 are the same or different and are selected from substituted or unsubstituted C6-C10 aryl, R is selected from linear or branched C1-C4 alkyl, substituted or unsubstituted C6-C10 aryl, and substituted or unsubstituted C3-C10 cycloalkyl, wherein the oligomerization is carried out in a solvent, which is a bicyclic compound or a mixture of bicyclic compounds, preferably decalin. The claimed method provides a significant increase in the activity of the catalyst during the oligomerization process and, as a consequence, a reduction in the catalyst unit consumption, as well a reduction in the formation of polymer by-product.