Transition metal catalysts

Details Transition metal catalysts Transition metal catalysts

2007-02-01

2011-11-29

Lu, Caixia (Department: 1765)

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

By addition of entire unsaturated molecules, e.g.,...

C502S103000, C502S162000, C502S167000

Reexamination Certificate

active

08067654

ABSTRACT:
Transition metal catalysts comprise(a) a source of a Group 3 to 10 transition metal,(b) a ligand having the formula:in-line-formulae description="In-line Formulae" end="lead"?R1R2X—Y—XR3R4in-line-formulae description="In-line Formulae" end="tail"?whereinX is phosphorus, arsenic or antimony,Y is a bridging group having the formula:in-line-formulae description="In-line Formulae" end="lead"?Z-(A)-D-Rmin-line-formulae description="In-line Formulae" end="tail"?whereinZ is the moiety linking the X groups,A is a linear or cyclic hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl linking group wherein the number of atoms directly linking Z to D is 1, 2 or 3,D is N, P, As, O, S or Se,R is hydrogen, alkyl, hydrocarbyl, substituted hydrocarbyl, heteroalkyl, heterohydrocarbyl or substituted heterohydrocarbyl, andm is 1 or 2,R1, R2, R3, and R4are the same or different and represent hydrocarbyl or functionalized hydrocarbyl moietieswith the proviso that if D is nitrogen, R is not a cyclic ether,and optionally an activator.The transition metal catalysts are suitable for the selective trimerisation or tetramerisation of olefins in particular ethylene.

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