Abstract: Disclosed is a method for the oligomerization of olefins, wherein an olefin is brought into contact with a catalyst system that is obtained from a chromium source, a cycloalkylalkyl-substituted triazacyclohexane, especially a 1,3,5-tris-(cycloalkylalkyl)-1,3,5-triazacyclohexane and an activator such as an alkyl aluminum compound or an alkylalumoxane.

Abstract: Ethylene or propylene are copolymerized with one another or with other olefinically unsaturated compounds in the presence of a catalyst system comprising the following components: A) a complex of a transition metal with one or two substituted or unsubstituted 1,3,5-triazacyclohexane ligands or corresponding ligands in which one or more of the ring nitrogens are replaced by phosphorus or arsenic atoms, and B) if desired, one or more activator compounds.

Abstract: An oligomerization catalyst for olefins is obtainable from a) a chromium compound CrX3 and the at least equimolar amount, based on the chromium compound CrX3, of a ligand L or from an existing chromium complex CrX3L, in which the groups X are, independently of one another, abstractable counterions and L is a 1,3,5-triazacyclohexane of the formula I ?where the groups R1 to R9 are, independently of one another: hydrogen or organosilicon or substituted or unsubstituted carboorganic groups having from 1 to 30 carbon atoms, where two geminal or vicinal radicals R1 to R9 may also be joined to form a five—or six-membered ring, and b) at least one activating additive and also a process for preparing oligomers of olefins using these catalysts, the oligomers thus obtainable, and the oxo alcohols obtainable from these oligomers.

Abstract: The polymerization of olefins is carried out in the presence of catalysts comprising at least one complex of a transition metal with a tridentate macrocyclic ligand which additionally bears at least one functional substituent and, if desired, one or more activator compounds. A catalyst system comprising at least one transition metal complex as set forth above and at least one activator compound is also provided.