Patent ID: 7638671
Filing Date: 2009-12-29
Classification: B01J,C07C,C08F

Abstract:
1. A method of producing oligomers of olefins, comprising reacting an olefin with a catalyst under oligomerization conditions, wherein said oligomerization reaction has a selectivity of at least 70 mole percent for oligomer, and wherein said catalyst is formed from the combination of: (1) a ligand characterized by the following general formula: wherein R 1 and R 20 are each independently selected from the group consisting of hydrogen and optionally substituted hydrocarbyl, heteroatom containing hydrocarbyl and silyl, provided that R 1 or R 20 do not equal T-J, where T-J is as given by the general formula above and defined below; T is a bridging group of the general formula -(T′R J is an optionally substituted five-membered heterocycle, containing at least one nitrogen atom as part of the ring; (2) a metal precursor compound characterized by the general formula Cr(L) (3) optionally, one or more activators.