US4695669A
Expired / Lapsed
US
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Process for propylene dimerization
Assignee: Dow Chemical Co
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Filing: 1986-09-02
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Granted: 1987-09-22
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Expires: 2006-09-02
Abstract
Abstract Uranium di(poly-substituted cyclopentadienyl)-hydride complexes, as well as certain uranium (IV) and rare earth metal complexes, can be employed to catalyze the dimerization of propylene to form selectively 4-methyl-1-pentene.
Inventors
- 👤 James C. Stevens
- 👤 William A. Fordyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:06
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C11/107; C07C11/113; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/26; C07C2/32; C07C2/34; C07C2531/00; C07C2531/16; C07C2531/22; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
39 words
A process for the preparation of 4-methyl-1-pentene, the process comprising contacting propylene and a catalyst comprising uranium under reaction conditions to produce 4-methyl-1-pentene with a selectivity of at least 94 mole percent with respect to other C 6 olefins.
Claim 2
Dependent Claim
39 words
A process for the preparation of 4-methyl-1-pentene, the process comprising contacting propylene and a catalyst comprising uranium under reaction conditions to produce 4-methyl-1-pentene with a selectivity of at least 94 mole percent with respect to other C 6 olefins.
Claim 3
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 4
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 5
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 6
Dependent Claim
32 words
A process comprising contacting propylene and a catalyst comprising uranium under reaction conditions to product 4-methyl-1-pentene with a selectivity with respect to all C 6 compounds of at least 94 mole percent.
Claim 7
Dependent Claim
32 words
A process comprising contacting propylene and a catalyst comprising uranium under reaction conditions to product 4-methyl-1-pentene with a selectivity with respect to all C 6 compounds of at least 94 mole percent.
Claim 8
Dependent Claim
22 words
The process of claim 5 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 5 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 5 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 5 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 9 wherein the overall selectivity is at least about 96 mole percent.
Claim 13
Dependent Claim
28 words
A process for the selective preparation of 4-methyl-1-pentene, the process comprising contacting propylene and a catalyst comprising a uranium di(poly-substituted cyclopentadienyl)-hydride complex under reaction conditions to produce 4-methyl-1-pentene.
Claim 14
Dependent Claim
28 words
A process for the selective preparation of 4-methyl-1-pentene, the process comprising contacting propylene and a catalyst comprising a uranium di(poly-substituted cyclopentadienyl)-hydride complex under reaction conditions to produce 4-methyl-1-pentene.
Claim 15
Dependent Claim
66 words
A process comprising contacting propylene with a catalyst selected from the group consisting of: (a) a uranium (III)-di(poly-substituted cyclopentadienyl)-hydride complex; (b) a uranium (IV)-di(poly-substituted cyclopentadienyl)-dihydrogen complex; and (c) a uranium (III) or uranium (IV) di(poly-substituted cyclopentadienyl)-alkyl complex, and the active catalyst is prepared in situ by subjecting the alkyl complex to gaseous hydrogen in order to preform the hydride catalyst; under reaction conditions to produce 4methyl-1-pentene.
Claim 16
Dependent Claim
66 words
A process comprising contacting propylene with a catalyst selected from the group consisting of: (a) a uranium (III)-di(poly-substituted cyclopentadienyl)-hydride complex; (b) a uranium (IV)-di(poly-substituted cyclopentadienyl)-dihydrogen complex; and (c) a uranium (III) or uranium (IV) di(poly-substituted cyclopentadienyl)-alkyl complex, and the active catalyst is prepared in situ by subjecting the alkyl complex to gaseous hydrogen in order to preform the hydride catalyst; under reaction conditions to produce 4methyl-1-pentene.
Claim 17
Dependent Claim
16 words
The process of claim 12 wherein the selectivity to 4-methyl-1-pentene is at least 94 mole percent.
Claim 18
Dependent Claim
47 words
The process of claim 13 wherein each poly-substituted cyclopentadienyl moiety is represented by the formula: ##STR2## 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 19
Dependent Claim
23 words
The process of claim 14 wherein each R is methyl or H, with the proviso that at least 2 R moieties are methyl.
Claim 20
Dependent Claim
60 words
A process for the selective preparation of 4-methyl-1-pentene, the process comprising contacting propylene with a catalyst of the formula: [(Cp*).sub.2 --M.sup.+x --H.sub.(x--2)].sub.y wherein Cp* is pentahaptopentamethylcyclopentadienyl, X equals 3 or 4, M is U, and y is 1 or 2, the contacting being in a substantially inert environment at a temperature of from about 10° C. to about 180° C.
Claim 21
Dependent Claim
60 words
A process for the selective preparation of 4-methyl-1-pentene, the process comprising contacting propylene with a catalyst of the formula: [(Cp*).sub.2 --M.sup.+x --H.sub.(x--2)].sub.y wherein Cp* is pentahaptopentamethylcyclopentadienyl, X equals 3 or 4, M is U, and y is 1 or 2, the contacting being in a substantially inert environment at a temperature of from about 10° C. to about 180° C.
Claim 22
Dependent Claim
9 words
The process of claim 16 wherein x is 3.
Claim 23
Dependent Claim
9 words
The process of claim 16 wherein x is 4.
Claim 24
Dependent Claim
18 words
The process of claim 16 wherein the contacting is conducted in the presence of a substantially inert solvent.
Claim 25
Dependent Claim
17 words
The process of claim 16 wherein the overall selectivity to 4-methyl-1-pentene is at least 94 mole percent.
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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) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |