US4851598A
Expired / Lapsed
US
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Method of preparing metallocene compounds
Assignee: Brandeis University
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Filing: 1987-12-28
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Granted: 1989-07-25
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Expires: 2007-12-28
Abstract
Abstract This invention describes a novel method of preparing metallocene compounds. The invention is based on synthesis of novel bis cyclopentadienides that, under appropriate conditions, will either encapsulate a transition metal to produce a metallocene such as ferrocene, or ferrocene derivative, or will yield a polymeric metallocene. Compounds produced by this process are useful as catalyst in propulsion systems, or as anti-knock compounds in gasolines.
Inventors
- 👤 Myron Rosenblum
- 👤 Stephen A. Matchett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:16
CPC Classifications
C; C07; C07F; C07F17/00; C07F17/02; C07C; C07C13/00; C07C13/28; C07C13/32; C07C13/47; C07C2601/00; C07C2601/06; C07C2601/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
Compounds of the formula R 1 --R--R 2 , wherein R 1 =R 2 =the cyclopentadienyl ligand and R is a disubstituted aromatic compound selected from the group consisting of naphthalene substituted at the 1,8 positions, benzene substituted at the 1,4 positions, biphenyl substituted at the 4,4' positions, and anthracene at the 9,10 positions.
Claim 2
Dependent Claim
54 words
Compounds of the formula R 1 --R--R 2 , wherein R 1 =R 2 =the cyclopentadienyl ligand and R is a disubstituted aromatic compound selected from the group consisting of naphthalene substituted at the 1,8 positions, benzene substituted at the 1,4 positions, biphenyl substituted at the 4,4' positions, and anthracene at the 9,10 positions.
Claim 3
Dependent Claim
20 words
Compounds of the formula in claim 1, wherein one or both of the substituent cyclopentadienyl rings carry a negative charge.
Claim 4
Dependent Claim
4 words
The compound 1,8 biscyclopentadienylnaphthalene.
Claim 5
Dependent Claim
4 words
The compound 1,8 biscyclopentadienylnaphthalene.
Claim 6
Dependent Claim
75 words
The compound 1,8 biscyclopentadienyl naphthalene, produced according to a process comprising the steps of: a. reacting lithiated cyclopentadiene with 1,8 diiodonaphthalene in the presence of a copper bromide-dimethylsulfide complex at about minus 20° C. for about 12 hours; b. quenching the reaction by adding saturated ammonium chloride; c. separating the organic phase, drying with MgSO 4 , evaporating the solvent; and d. extracting the residue with hexane, evaporating the solvent and purifying the product chromatographically.
Claim 7
Dependent Claim
75 words
The compound 1,8 biscyclopentadienyl naphthalene, produced according to a process comprising the steps of: a. reacting lithiated cyclopentadiene with 1,8 diiodonaphthalene in the presence of a copper bromide-dimethylsulfide complex at about minus 20° C. for about 12 hours; b. quenching the reaction by adding saturated ammonium chloride; c. separating the organic phase, drying with MgSO 4 , evaporating the solvent; and d. extracting the residue with hexane, evaporating the solvent and purifying the product chromatographically.
References Cited (Backward Citations)
US3437634A
Cited
US3504052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |