USRE29338E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of esters of carbonic acid
Assignee: ENICHEM SYNTHESIS SpA PALERMO ITALY A CORP OF ITALY
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Filing: 1976-09-28
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Granted: 1977-08-02
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Expires: 1996-09-28
Abstract
Abstract A process is described whereby carbonic acid esters, i.e., alkyl, aryl and cycloalkyl carbonates, are prepared by reacting an alcohol with oxygen and carbon monoxide in the presence of a catalyst selected from copper complexed with an organic molecule.
Inventors
- 👤 Emilio Perrotti
- 👤 Gioacchino Cipriani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:13
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/01
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A process for the preparation of esters of carbonic acid having the general formula: ##STR2## wherein R is a hydrocarbon radical selected from the class consisting of alkyl, aryl or cycloalkyl radicals characterized in that an alcohol represented by the formula ROH in which R has the aforesaid meaning is reacted with carbon monoxide and oxygen in the presence of a catalyst consisting of cuprous chloride complexed with an organic ligand selected from the group consisting of pyridine, dipyridyl, imidazole, phenanthroline alkyl or aryl, phosphines, dimethylsulfoxide, dimethylformamide, quinuclidine, CH 3 CN, C 6 H 5 CN, malonitrile, succinodinitrile and adiponitrile.
Claim 2
Dependent Claim
100 words
A process for the preparation of esters of carbonic acid having the general formula: ##STR2## wherein R is a hydrocarbon radical selected from the class consisting of alkyl, aryl or cycloalkyl radicals characterized in that an alcohol represented by the formula ROH in which R has the aforesaid meaning is reacted with carbon monoxide and oxygen in the presence of a catalyst consisting of cuprous chloride complexed with an organic ligand selected from the group consisting of pyridine, dipyridyl, imidazole, phenanthroline alkyl or aryl, phosphines, dimethylsulfoxide, dimethylformamide, quinuclidine, CH 3 CN, C 6 H 5 CN, malonitrile, succinodinitrile and adiponitrile.
Claim 3
Dependent Claim
62 words
A process according to claim 1 characterized in that the reaction is carried out in a solvent adapted to produce azeotropic mixtures with water and selected from: a. the same alcohol as that from which the ester is prepared; b. an organic compound adapted to be complexed by the employed catalyst; c. an inert solvent; or a mixture of the said solvents.
Claim 4
Dependent Claim
24 words
A process according to claim 2 characterized in that the solvent is the reactant alcohol and the catalyst is put in as a complex.
Claim 5
Dependent Claim
23 words
A process according to claim 1 characterized in that the temperature is preferably selected in the range from -20° C. to +110° C.
Claim 6
Dependent Claim
31 words
A process according to claim 4 characterized in that the pressure is sufficient to ensure that the employed solvent will be kept in the liquid state at the process temperature. .Iadd.
Claim 7
Dependent Claim
101 words
A process for the preparation of esters of carbonic acid having the general formula: ##STR3## wherein R is a hydrocarbon radical selected from the class consisting of alkyl, aryl or cycloalkyl radicals characterized in that an alcohol represented by the formula ROH in which R has the aforesaid meaning is reacted with carbon monoxide and oxygen in the presence of a catalyst consisting of cuprous chloride complexed with an organic ligand selected from the group consisting of pyridine, dipyridyl, imidazole, phenanthroline alkyl or aryl, phosphines, dimethylsulfoxide, dimethylformamide, quinuclidine, CO, CH 3 CN, C 6 H 5 CH, malonitrile, succinodinitrile and adiponitrile..Iaddend.
Claim 8
Dependent Claim
101 words
A process for the preparation of esters of carbonic acid having the general formula: ##STR3## wherein R is a hydrocarbon radical selected from the class consisting of alkyl, aryl or cycloalkyl radicals characterized in that an alcohol represented by the formula ROH in which R has the aforesaid meaning is reacted with carbon monoxide and oxygen in the presence of a catalyst consisting of cuprous chloride complexed with an organic ligand selected from the group consisting of pyridine, dipyridyl, imidazole, phenanthroline alkyl or aryl, phosphines, dimethylsulfoxide, dimethylformamide, quinuclidine, CO, CH 3 CN, C 6 H 5 CH, malonitrile, succinodinitrile and adiponitrile..Iaddend.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |