Procédé de fabrication de mono-oléfines à teneur élevée en bêta-oléfines

1,153,827. Oligomerizing olefins. SENTRALINSTITUTT FOR INDUSTRIELL FORSKNING. 6 April, 1967 [15 April, 1966], No. 15916/67. Heading C5E. C 4-50 mono-olefines are obtained by oligo. merizing or co-oligomerizing C 2-15 mono-olefins in the absence of di-olefins and in the presence of a catalyst system of one of the following five types: Me(X) n + Lewis acid + Lewis base Me(X) n + Lewis acid. Lewis base Me(X) n Lewis base + Lewis acid Me(X) n Lewis base + Lewis acid + Lewis base Me(X) n Lewis base + Lewis acid. Lewis base. where Me is a Group VIII transition metal, X is a chelate-forming group, a hydrocarbon radical, a thiophenotate or nitroso radical, or an organic or inorganic acid radical, and n is 2 or 3, at such a temperature that Me(X) n is not reduced to metallic Me. The Lewis acid is one of the following: AL(Y) 3 , Ga(Y) 3 , In(Y) 3 , Be(R) 2 , Be(R)(Y), Al(R) a (Y) 3-a, Ga(R) a (Y) 3-a or In(R) a (Y) 3-a, where Y is a halide, alcoholate, mercaptide, amide or phosphide radical, R is hydrogen or a C 1-50 aliphatic or aromatic hydrocarbon radical, and a is 1-2. The Lewis base is a mono-, di- or polyfunctional organic or inorganic compound containing one or more of the base groups Many such catalyst systems are given in examples illustrating oligomerization of ethylene, propylene, butenes, and mixtures thereof to mixtures of mainly beta- and gamma-olefins, The subject matter of specification 1,124,123 is disclaimed.