Claims
- 1. A process for oligomerizing one or more olefins having from about 2 to about 20 carbon atoms which comprises contacting said olefin in liquid phase at a temperature in the range of from about 0.degree. C. to about 200.degree. C. in the presence of a catalyst prepared by a process which comprises reacting a catalyst precursor ligand having a formula ##STR8## wherein R.sub.1 and R.sub.2 each independently is an alkyl, alkoxy, aryl, or aryloxy group having from about 1 to about 20 carbon atoms, with the proviso that R.sub.1 and R.sub.2 are not both aryl, or R.sub.1 and R.sub.2 together form a divalent hydrocarbon moiety, and X is 1,2-arylene, O-CH.sub.2, S-CH.sub.2, or Se-CH.sub.2, with a deprotonation source, a transition metal compound selected form the group consisting of nickel salts, chromium salts, cobalt salts, iron salts, copper salts and mixtures thereof, and a catalyst activator, wherein the molar ratio of catalyst activator to transition metal compound is at least about 1:1.
- 2. The process of claim 1 wherein said catalyst precursor ligand has a formula ##STR9## wherein R.sub.1 is an alkyl, alkoxy or aryloxy group having from about 1 to about 20 carbon atoms and R.sub.2 is an alkyl, alkoxy or aryloxy group having from about 1 to about 20 carbon atoms, and X is 1,2-arylene, O-CH.sub.2, S-CH.sub.2, or Se-CH.sub.2.
- 3. The process of claim 1 wherein said catalyst precursor ligand has a formula ##STR10## wherein R.sub.1 is an alkyl, alkoxy or aryloxy group having from about 1 to about 20 carbon atoms and R.sub.2 is an aryl group, and X is 1,2-arylene, O-CH.sub.2, S-CH.sub.2, or Se-CH.sub.2.
- 4. The process of claim 1 wherein said catalyst precursor ligand has a formula ##STR11## wherein R.sub.1 and R.sub.2 together form a ring having from about 4 to about 10 members.
- 5. The process of claim 1 wherein said deprotonation source is selected from the group consisting of sodium hydroxide, potassium hydroxide, alkali metals, alkyl metals and mixtures thereof.
- 6. The process of claim 1 wherein said transition metal is a nickel salt.
- 7. The process of claim 1 wherein said catalyst activator is selected from the group consisting of borohydrides, aryl boranes, borane (BH.sub.3), mono-, di-, and trialkyl boranes, aryl borates, tri and tetra coordinate organoaluminum compounds, aluminum hydrides, tri and tetra alkyl boron compounds, organozinc compounds, and mixtures thereof.
Parent Case Info
This is a division of application Ser. No. 08/140,643, filed Oct. 21, 1993, and now U.S. Pat. No. 5,439,862.
US Referenced Citations (13)
Non-Patent Literature Citations (1)
Entry |
J. Am. Chem. Soc. 1981, 1234-1235, "A Stable Monocyclic Triarylalkoxy P-H Phosphorane, a 10-P-5 Species with an Apical P-H Bond, and It's Conjugate Base, a Phosphoramide", Michael R. Ross and J. C. Martin. |
Divisions (1)
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Number |
Date |
Country |
Parent |
140643 |
Oct 1993 |
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