US4182726A
Expired / Lapsed
US
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Process for the preparation of aromatic carbonates
Assignee: SnamProgetti SpA
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Filing: 1977-03-28
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Granted: 1980-01-08
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Expires: 1997-03-28
Abstract
Abstract An aromatic carbonate having the formula: ##STR1## wherein R' is alkyl and R is alkyl, alkoxy, aryl, aryloxy or NO 2 , is prepared by reacting the related phenol or an acyl ester thereof with an alkyl, cyclic or aryl-alkyl carbonate in the presence of a catalyst such as AlCl 3 .
Inventors
- 👤 Gabriello Illuminati
- 👤 Ugo Romano
- 👤 Renato Tesei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:22
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
148 words
The process of preparing an aromatic carbonate having the formula: ##STR3## wherein R' is alkyl and R is a member of the group consisting of H, alkyl, alkoxy, aryl, aryloxy and NO 2 , which comprises reacting a phenolic compound consisting of the respective phenol, or an acyl ester thereof, with an alkyl or aryl-alkyl carbonate in the presence of a catalyst selected from the group consisting of AlX 3 , UX 3 , TiX 3 , TiX 4 , VOX 3 , VX 5 , ZnX 2 , FeX 3 and SnX 4 , wherein X is a member of the group consisting of halogen, alkoxy, aryloxy and acetoxy, in the liquid phase, at a temperature in the range of from 25° to 350° C., at a pressure in the range of from 0.1 to 100 atmospheres, and wherein the phenol/carbonate ratio is from 100:1 to 1:100.
Claim 2
Dependent Claim
148 words
The process of preparing an aromatic carbonate having the formula: ##STR3## wherein R' is alkyl and R is a member of the group consisting of H, alkyl, alkoxy, aryl, aryloxy and NO 2 , which comprises reacting a phenolic compound consisting of the respective phenol, or an acyl ester thereof, with an alkyl or aryl-alkyl carbonate in the presence of a catalyst selected from the group consisting of AlX 3 , UX 3 , TiX 3 , TiX 4 , VOX 3 , VX 5 , ZnX 2 , FeX 3 and SnX 4 , wherein X is a member of the group consisting of halogen, alkoxy, aryloxy and acetoxy, in the liquid phase, at a temperature in the range of from 25° to 350° C., at a pressure in the range of from 0.1 to 100 atmospheres, and wherein the phenol/carbonate ratio is from 100:1 to 1:100.
Claim 3
Dependent Claim
29 words
The process as claimed in claim 1, wherein said phenolic compound is a member of the group consisting of phenol, p-cresol, hydroquinone-monoethyl ether, p-nitrophenol, phenylacetate and bisphenol A bisacetate.
Claim 4
Dependent Claim
26 words
The process as claimed in claim 1, wherein said alkyl or aryl-alkyl carbonate is a member of the group consisting of dimethylcarbonate, diethylcarbonate, phenylethylcarbonate and phenylmethylcarbonate.
Claim 5
Dependent Claim
29 words
The process as claimed in claim 3, wherein said phenolic compound is a member of the group consisting of phenol, p-cresol, hydroquinone-monoethyl ether, p-nitrophenol, phenylacetate and bisphenol A bisacetate.
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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |