US4138441A
Expired / Lapsed
US
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Synthesis of substituted cyclopentadienes and cyclopentadiene-functionalized polymers
Assignee: Individual
•
Filing: 1977-02-22
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Granted: 1979-02-06
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Expires: 1997-02-22
Abstract
Abstract Aluminum cyclopentadienyl compounds can be used to synthesize a variety of organic molecules containing the cyclopentadiene group, e.g., substituted cyclopentadiene compounds, polymer molecules with cyclopentadiene pendant groups, and polymer molecules with cyclopentadiene terminal groups.
Inventors
- 👤 Joseph P. Kennedy
- 👤 Kenneth F. Castner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:16
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/32; C07C1/325; C07C1/327; C08; C08F; C08F10/00; C08F8/00; C07C2601/00; C07C2601/06; C07C2601/10; C08F110/00; C08F110/04; C08F110/08; C08F110/10; C08F210/00; C08F210/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
A method of preparation of hydrocarbon-substituted cyclopentadienes which comprises reacting a compound of the formula R x 'Al(CPD) y wherein CPD represents the cyclopentadienyl group, R' represents an alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkaryl or aryl group, y equals 1 to 2 and x equals 2 to 1 and the sum of x plus y is equal to 3, with a tertiary, allylic or benzylic halide of the formula RX, wherein R is selected from the group consisting of alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkaryl or aryl, and X represents chlorine, bromine or iodine.
Claim 2
Independent Claim
92 words
A method of preparation of hydrocarbon-substituted cyclopentadienes which comprises reacting a compound of the formula R x 'Al(CPD) y wherein CPD represents the cyclopentadienyl group, R' represents an alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkaryl or aryl group, y equals 1 to 2 and x equals 2 to 1 and the sum of x plus y is equal to 3, with a tertiary, allylic or benzylic halide of the formula RX, wherein R is selected from the group consisting of alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkaryl or aryl, and X represents chlorine, bromine or iodine.
Claim 3
Dependent Claim
21 words
The method according to claim 1 in which the mole ratio of RX/R x 'Al(CPD) y ranges from 0.1/1 to 1.0/1.
Claim 4
Dependent Claim
23 words
The method according to claim 2 in which RX is tertiary butyl chloride and R x 'Al(CPD) y is dimethylaluminum cyclopentadiene or dimethyl(cyclopentadienyl)aluminum.
References Cited (Backward Citations)
US2953607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |