US4045464A
Expired / Lapsed
US
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Process for the preparation of aromatic carbonates
Assignee: ENICHEM SYNTHESIS SpA AN ITALIAN Co
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Filing: 1975-12-01
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Granted: 1977-08-30
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Expires: 1995-12-01
Abstract
Abstract The invention relates to a process for preparing diaryl carbonates starting from phenyl alkyl carbonates, the reaction being carried out in the presence of suitable catalysts capable of affording greater yields and selectivity; the catalyst system is selected amongst the Lewis acids or the compounds of transition metals.
Inventors
- 👤 Ugo Romano
- 👤 Renato Tesei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:45
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/06; C07D; C07D307/00; C07D307/77; C07D307/93; C07D307/935
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
A process for the preparation of aromatic carbonates of the formula: ##STR3## wherein R is selected from among the alkyl, alkoxy, aryl, aryloxy, NO 2 groups, and hydrogen, comprising contacting the compound of the formula: ##STR4## wherein R has the same meaning as in Formula I and wherein R' is a non tertiary alkyl group, with a catalyst system comprised of titanium tetraphenate or titanium tetramethylate, at a temperature of 25° - 350° C and at a pressure of from 0.1 - 100 atmospheres absolute.
Claim 2
Dependent Claim
85 words
A process for the preparation of aromatic carbonates of the formula: ##STR3## wherein R is selected from among the alkyl, alkoxy, aryl, aryloxy, NO 2 groups, and hydrogen, comprising contacting the compound of the formula: ##STR4## wherein R has the same meaning as in Formula I and wherein R' is a non tertiary alkyl group, with a catalyst system comprised of titanium tetraphenate or titanium tetramethylate, at a temperature of 25° - 350° C and at a pressure of from 0.1 - 100 atmospheres absolute.
Claim 3
Dependent Claim
38 words
A process as claimed in claim 1 wherein said compound of Formula II is contacted with said catalyst at a temperature of from 80° - 250° C and at a pressure of from 1 to 25 atmospheres absolute.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 1 wherein R is hydrogen and wherein R' is selected from among methyl and ethyl.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 2 wherein R is hydrogen and wherein R' is selected from among methyl and ethyl.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |