Catalytic trimerization of olefinic monomers

Details Catalytic trimerization of olefinic monomers Catalytic trimerization of olefinic monomers

2007-09-25

2007-09-25

Lu, Caixia (Department: 1713)

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

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

C585S502000, C585S510000

Reexamination Certificate

active

10959561

ABSTRACT:
A catalyst composition suitable for the trimerization of olefinic monomers, wherein the catalyst composition comprises:a) a source of chromium, molybdenum or tungsten;b) a ligand of general formula (I);in-line-formulae description="In-line Formulae" end="lead"?(R1)(R2)P—X—P(R3)(R4)  (I)in-line-formulae description="In-line Formulae" end="tail"?wherein:X is a bivalent organic bridging group;R1and R3are independently selected from, hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl and substituted heterohydrocarbyl groups, with the proviso that when R1and R3are cycloaromatic groups they do not contain a polar substituent at any of the ortho-positions;R2and R4are independently selected from optionally substituted cycloaromatic groups, each R2and R4bearing a polar substituent on at least one of the ortho-positions; andc) a cocatalyst.The present invention further relates to a process for the trimerization of olefinic monomers, particularly the trimerization of ethylene to 1-hexene, wherein the process comprises contacting at least one olefinic monomer with the catalyst composition described hereinabove.

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“High Activity Ethylene Trimerisation Catalysts Based on Diphosphine Ligands,” by Anthea Carter, Steven A. Cohen, Neil A. Cooley, Aden Murphy, James Scutt, and Duncan F. Wass, Chem. Commun., 2002, 8, pp. 858-859.
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