Patent US4008260A successfully refreshed from Google Patents.
US4008260A
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Process for preparing cobalt(III)acetylacetonate
Assignee: Wacker Chemie AG
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Filing: 1975-03-24
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Granted: 1977-02-15
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Expires: 1995-03-24
Abstract
Abstract Process for preparing cobalt(III)acetylacetonate comprising the steps of adding to cobalt(II)acetylacetonate in an organic solvent, at least the stoichiometric amount of acetylacetone, oxidizing with an excess of hydrogen peroxide, and separating the obtained cobalt(III)acetylacetonate by cooling and or concentration of the solution. The product obtained after drying is analytically pure and may be directly used as a catalyst for many chemical reactions, such as dimerizations, oligomerizations and polymerizations, oxidations and hydrogenations of olefins and many more.
Inventors
- 👤 Gerhard Kunstle
- 👤 Herbert Siegl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:54
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C07; C07F; C07F15/00; C07F15/06; C07F15/065
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A process for the preparation of cobalt(III)acetylacetonate having a black fine crystalline structure and a water content of less than 0.05% by weight, comprising the steps of: a. dissolving cobalt (II) acetylacetonate in an organic solvent; b. adding to the solution at a temperature between about 20° and about 60° C at least the stoichiometric amount of acetylacetone to provide an additional mol thereof; c. adding aqueous 25% to 35% hydrogen peroxide solution in an excess amount of 1.5 to 2.5 mols, with stirring, at a temperature between about 20° and 100° C until oxidation is complete; and d. boiling off excess hydrogen peroxide, cooling the solution, and recovering the precipitated solid cobalt(III)acetylacetonate therefrom.
Claim 2
Dependent Claim
114 words
A process for the preparation of cobalt(III)acetylacetonate having a black fine crystalline structure and a water content of less than 0.05% by weight, comprising the steps of: a. dissolving cobalt (II) acetylacetonate in an organic solvent; b. adding to the solution at a temperature between about 20° and about 60° C at least the stoichiometric amount of acetylacetone to provide an additional mol thereof; c. adding aqueous 25% to 35% hydrogen peroxide solution in an excess amount of 1.5 to 2.5 mols, with stirring, at a temperature between about 20° and 100° C until oxidation is complete; and d. boiling off excess hydrogen peroxide, cooling the solution, and recovering the precipitated solid cobalt(III)acetylacetonate therefrom.
Claim 3
Dependent Claim
27 words
The process according to claim 1 wherein in step (b) the acetylacetone is added in an excess of 5 to 10 molar % of the stoichiometric amount.
Claim 4
Dependent Claim
15 words
The process according to claim 1 wherein the cobalt(III)acetylacetonate is separated by concentrating the solution.
Claim 5
Dependent Claim
20 words
The process according to claim 1 wherein the oxidation is carried out at a temperature of 40° to 80° C.
Claim 6
Dependent Claim
26 words
The process according to claim 1 comprising the additional step of drying the separated cobalt(III)acetylacetonate at a temperature of 20° to 100° C under reduced pressure.
References Cited (Backward Citations)
US3474464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |