US4244881A
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Process for preparing alpha-naphthol esters of aliphatic carboxylic acids
Assignee: Montedison SpA
•
Filing: 1979-03-28
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Granted: 1981-01-13
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Expires: 1999-03-28
Abstract
Abstract Alpha-naphthol esters of aliphatic carboxylic acids are prepared by oxidation of naphthalene in the presence of cobalt compounds.
Inventors
- 👤 Claudio Giordano
- 👤 Aldo Belli
- 👤 Francesco Minisci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:55
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/04; C07C67/05
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
126 words
A process for preparing alpha-naphthol esters of aliphatic carboxylic acids by reaction of naphthalene with aliphatic carboxylic acids, characterized in that naphthalene is reacted with an aliphatic carboxylic acid in a medium consisting of an aliphatic carboxylic acid and in the presence of a system composed of a compound of cobalt II selected from the group consisting of cobalt enolate, cobalt salts of inorganic anions, and cobalt salts of organic anions of aliphatic carboxylic acids R-COOH in which R is an alkyl group containing up to 10 carbon atoms; of a ketone containing in its structure at least a methylene or methine group in alpha position with respect to the carbonyl group; and of oxygen, at a temperature of from about 70° to about 110° C.
Claim 2
Dependent Claim
126 words
A process for preparing alpha-naphthol esters of aliphatic carboxylic acids by reaction of naphthalene with aliphatic carboxylic acids, characterized in that naphthalene is reacted with an aliphatic carboxylic acid in a medium consisting of an aliphatic carboxylic acid and in the presence of a system composed of a compound of cobalt II selected from the group consisting of cobalt enolate, cobalt salts of inorganic anions, and cobalt salts of organic anions of aliphatic carboxylic acids R-COOH in which R is an alkyl group containing up to 10 carbon atoms; of a ketone containing in its structure at least a methylene or methine group in alpha position with respect to the carbonyl group; and of oxygen, at a temperature of from about 70° to about 110° C.
Claim 3
Dependent Claim
26 words
The process of claim 1, in which the medium is an aliphatic carboxylic acid R-COOH, wherein R is an alkyl having up to 10 carbon atoms.
Claim 4
Dependent Claim
29 words
The process of claim 2, in which the aliphatic carboxylic acid R-COOH used as medium is the aliphatic carboxylic acid used to form the salt of the cobalt II.
Claim 5
Dependent Claim
14 words
The process of claim 1, in which air is used as the oxygen source.
Claim 6
Dependent Claim
23 words
The process of claim 1, in which the compound of cobalt II is the anhydrous or hydrated acetate, propionate, chloride, sulphate or acetylacetonate.
Claim 7
Dependent Claim
29 words
The process of claim 1, in which the cobalt II compound is used in an initial molar ratio with respect to the naphthalene ranging from about 10:1 to 1:10.
Claim 8
Dependent Claim
29 words
The process of claim 1, in which the cobalt II compound is used in an initial molar ratio, with respect to the naphthalene, of from about 2:1 to 1:2.
Claim 9
Dependent Claim
22 words
The process of claim 1, in which the initial concentration of the cobalt II compound is from about 0.2 to 0.5 mole/liter.
Claim 10
Dependent Claim
15 words
The process of claim 1, in which the temperature is maintained at about 90° C.
Claim 11
Dependent Claim
32 words
The process of claim 1, in which the oxygen flow and/or the flow of the gas containing it ranges from 60 to 600 liter/hour of O 2 per mole of cobalt II.
Claim 12
Dependent Claim
34 words
The process of claim 1, in which the ketone containing in its structure a methylene or methine group in alpha position with respect to the carbonyl group is an aliphatic, cycloaliphatic or aliphatic-aromatic ketone.
Claim 13
Dependent Claim
19 words
The process of claim 11, in which the ketone is ethylmethyl ketone, diethyl ketone, cyclohexanone, propiophenone or methylisopropyl ketone.
Claim 14
Dependent Claim
27 words
The process of claim 1, in which the ketone is introduced in a molar ratio to the initial cobalt compound ranging from about 4:1 to about 8:1.
Claim 15
Dependent Claim
19 words
The process of claim 1, in which the inorganic salt of Co II is employed associated with buffering agents.
Claim 16
Dependent Claim
15 words
The process of claim 14, in which the buffering agent is sodium or potassium acetate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |