US3937737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of aromatic 1,3-diketones
Assignee: Hoechst AG
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Filing: 1974-07-22
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Granted: 1976-02-10
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Expires: 1994-07-22
Abstract
Abstract Aromatic 1,3-diketones are produced by reacting aromatic compounds with acetoacetyl fluoride optionally substituted in γ-position by fluorine, chlorine and/or bromine, in hydrofluoric acid of at least 90% strength at a temperature of from about -40 to +50°C. The products obtained are important starting products and intermediates for the manufacture of dyestuffs, plastics and pharmaceuticals. Furthermore they can be used for the formation of metal complexes and metal extracting agents, solution intermediaries and solvents.
Inventors
- 👤 Kurt Eiglmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:10
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/76; C07C49/84; C07C45/00; C07C45/45; C07C45/46; C07C49/782; C07C49/788; C07C49/792; C07C49/80
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
A compound of the formula ##SPC4## wherein R' and R" each is hydrogen or alkyl and R' and R" together contain 6 to 12 carbon atoms, and each Y is hydrogen, fluorine, chlorine or bromine.
Claim 2
Dependent Claim
35 words
A compound of the formula ##SPC4## wherein R' and R" each is hydrogen or alkyl and R' and R" together contain 6 to 12 carbon atoms, and each Y is hydrogen, fluorine, chlorine or bromine.
Claim 3
Dependent Claim
6 words
α-and β-acetoacetyl-tetrahydronaphthalene of the formula ##SPC5##
Claim 4
Dependent Claim
6 words
α-and β-acetoacetyl-tetrahydronaphthalene of the formula ##SPC5##
Claim 5
Dependent Claim
7 words
Isomeric acetoacetyl-dialkyl benzenes of the formula ##SPC6##
Claim 6
Dependent Claim
7 words
Isomeric acetoacetyl-dialkyl benzenes of the formula ##SPC6##
References Cited (Backward Citations)
US2214117A
Cited
US2307891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |