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US4855523A
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Catalyst and process for the selective dimerization of propylene to 4-methyl-1-pentene
Assignee: Dow Chemical Co
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Filing: 1987-08-27
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Granted: 1989-08-08
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Expires: 2007-08-27
Abstract
Abstract Novel di(poly-substituted cyclopentadienyl)-allylic uranium complexes can be employed to catalyze the dimerization of propylene to form 4-methyl-1-pentene selectively. The novel catalyst complexes can be prepared from novel di(poly-substituted cyclopentadienyl)-U(IV) monohalo monoallylic complexes.
Inventors
- 👤 James C. Stevens
- 👤 William A. Fordyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:35
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/26; C07C2/32; C07C2/34; C07C2531/00; C07C2531/16; C07C2531/22
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
25 words
A process for the preparation of 4-methyl-1-pentene, the process comprising contacting propylene and a catalyst comprising a uranium(III) di(poly-substituted cyclopentadienyl)-allylic complex under dimerization reaction conditions.
Claim 2
Dependent Claim
25 words
A process for the preparation of 4-methyl-1-pentene, the process comprising contacting propylene and a catalyst comprising a uranium(III) di(poly-substituted cyclopentadienyl)-allylic complex under dimerization reaction conditions.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the selectivity with respect to other C 6 olefins is at least 94 mole percent.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the selectivity with respect to other C 6 olefins is at least about 96 mole percent.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the selectivity with respect to other C 6 olefins is at least about 98 mole percent.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the selectivity with respect to other C 6 olefins is at least about 99 mole percent.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein the selectivity with respect to all C 6 compounds is at least 94 mole percent.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein the selectivity with respect to all C 6 compounds is at least about 96 mole percent.
Claim 9
Dependent Claim
22 words
The process of claim 1 wherein the selectivity with respect to all C 6 compounds is at least about 98 mole percent.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein the selectivity with respect to all C 6 compounds is at least about 99 mole percent.
Claim 11
Dependent Claim
25 words
The process of claim 6 wherein the overall selectivity of 4-methyl-1-pentene is at least 94 mole percent with respect to all products of the process.
Claim 12
Dependent Claim
16 words
The process of claim 10 wherein the overall selectivity is at least about 96 mole percent.
Claim 13
Dependent Claim
69 words
The process of claim 1 wherein the catalyst comprises a compound of the formula: U(Cp*).sub.2 Q wherein Cp* is a poly-substituted cyclopentadienyl ligand, and Q is an allylic moiety, said cyclopentadienyl ligand being represented by the formula: ##STR4## wherein each R independently is H, alkyl of up to about 6 carbon atoms or alkyl substituted silyl, with the proviso that at least about 2 R moieties are not H.
Claim 14
Dependent Claim
16 words
The process of claim 12 wherein the selectivity to 4-methyl-1-pentene is at least 94 mole percent.
Claim 15
Dependent Claim
23 words
The process of claim 12 wherein each R is methyl or H, with the proviso that at least 2 R moieties are methyl.
Claim 16
Dependent Claim
51 words
A process for the selective preparation of 4-methyl-l-pentene, the process comprising contacting propylene with a catalyst of the formula: U(Cp*).sub.2 --Q wherein Cp* is pentahaptopentamethylcyclopentadienyl and Q is an allylic moiety; the contacting being in a substantially inert environment at a temperature of from about 10° C. to about 180° C.
Claim 17
Dependent Claim
51 words
A process for the selective preparation of 4-methyl-l-pentene, the process comprising contacting propylene with a catalyst of the formula: U(Cp*).sub.2 --Q wherein Cp* is pentahaptopentamethylcyclopentadienyl and Q is an allylic moiety; the contacting being in a substantially inert environment at a temperature of from about 10° C. to about 180° C.
Claim 18
Dependent Claim
18 words
The process of claim 15 wherein the contacting is conducted in the pressure of a substantially inert solvent.
Claim 19
Dependent Claim
9 words
The process of claim 15 wherein Q is allyl.
Claim 20
Dependent Claim
30 words
The process of claim 15 wherein the catalyst is employed in a catalytic amount ranging from about 1×10 -5 to about 1×10 -1 weight parts catalyst per weight part propylene.
Claim 21
Dependent Claim
20 words
The process of claim 15 wherein the contracting pressure is in the range from about 1 to about 500 atmospheres.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |