Oligomerization of Ethylene by Bis(acetylacetonato)nickel(II)-Triethyldialuminum Trichloride-Triphenylphosphine Catalyst -Formation of C₆-Olefins-

Abstract

In the oligomerization of ethyle:ne by Ni(acac)2-(C2H5)3Al2C13-P(C6H5)3 catalyst at a temperature higher than -10 C, a considerable amount of C6-olefins was formed together with C4-olefins (e.g., C4 40.6%, C6 43.8% at O C). Most of the C6-olefins consisted of 3-methyl-2-pentene (e.g., 82.9% at O C). The formation of the 3-methyl-2-pentene was found zero-conversion method was to be due toan insertion reaction of 2-butene to a nickel-ethyl bond. The effect of the basicity of tertiary phosphines on the formation of C4- and C6-olefins was discussedin terms of the above result.