Patent US3673232A successfully refreshed from Google Patents.
US3673232A
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Dicyclopentadienyl iron compounds
Assignee: Roche Palo Alto LLC
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Filing: 1970-04-01
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Granted: 1972-06-27
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Expires: 1990-04-01
Abstract
Abstract Production of dimers of dicyclopentadienyl iron compounds by the reaction of a dicyclopentadienyl iron compound and a ketonic coupling agent in the presence of an acid catalyst in an organic solvent. The process involves a two-phase system wherein one phase comprises said ketonic coupling agent, a strong acid, and a polar organic solvent; and the second phase comprises said iron compound which is slightly soluble in the first phase. The product dimers of dicyclopentadienyl iron compounds are useful as hematinic agents and in the cure of polymers. Those compounds substituted in at least one cyclopentadienyl ring are novel.
Inventors
- 👤 Meldon L Talbot
- 👤 Theodore T Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:08
CPC Classifications
C; C07; C07F; C07F17/00; C07F17/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
20 words
The process according to claim 1 wherein said dimeric condensation product prepared is selected from those of the following formula:
Claim 2
Dependent Claim
28 words
The process according to claim 2 conducted at a reaction temperature of between room temperature and the reflux temperaTure of the reaction mixture and under an inert atmosphere.
Claim 3
Dependent Claim
14 words
The process according to claim 3 wherein each R, independently, is hydrogen or alkyl.
Claim 4
Dependent Claim
11 words
The process according to claim 3 wherein each R1 is methyl.
Claim 5
Dependent Claim
36 words
The process according to claim 3 wherein the polar organic solvent is a lower saturated aliphatic alcohol, the strong acid is an inorganic acid, each R, independently, is hydrogen or alkyl, and each R1 is methyl.
Claim 6
Dependent Claim
36 words
The process according to claim 3 wherein the polar organic solvent is methanol, ethanol, or mixture thereof, the strong acid is sulfuric acid, and the reaction temperature is about the reflux temperature of the reaction mixture.
Claim 7
Dependent Claim
19 words
The process according to claim 7 wherein each R, independently, is hydrogen or alkyl and each R1 is methyl.
Claim 8
Dependent Claim
36 words
The process according to claim 3 wherein the polar organic solvent is methanol, ethanol, or mixture thereof, the strong acid is sulfuric acid, the iron compound is ethyl ferrocene, and the ketonic coupling agent is acetone.
Claim 9
Dependent Claim
13 words
The process according to claim 9 wherein the polar organic solvent is methanol.
Claim 10
Dependent Claim
9 words
The compound selected from those represented by the formula:
Claim 11
Dependent Claim
11 words
The compound according to claim 11 wherein each R1 is methyl.
Claim 12
Dependent Claim
19 words
The compound according to claim 11 wherein one R in each of the two dicyclopentadienyl iron moieties is alkyl.
Claim 13
Dependent Claim
11 words
The compound according to claim 13 wherein each R1 is methyl.
Claim 14
Dependent Claim
10 words
The compound according to claim 14 which is 2,2-bis(ethyldicyclopentadienyl iron)propane.
References Cited (Backward Citations)
US3035978A
Cited
US3437634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |