US3992407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aromatic bisimides
Assignee: General Electric Co
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Filing: 1976-04-14
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Granted: 1976-11-16
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Expires: 1996-04-14
Abstract
Abstract Aromatic bisimides can be prepared by effecting reaction between a 3- or 4-fluoro-N-substituted phthalimide with an aromatic dihydroxy compound in the presence of a certain class of solid alkali-metal fluorides and using a dipolar aprotic compound as a solvent.
Inventors
- 👤 Ronald L. Markezich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:17
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/1053; C08G73/1057; C08G73/1064; C08G73/1067; C08G73/1071
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
171 words
The process for making aromatic imides of the general formula ##SPC9## which comprises (1) effectin reaction under substantially anhydrous conditions between a fluorophthalimide of the general formula ##SPC10## with a dihydroxy compound of the general formula HO-R-OH where R is a member selected from the class consisting of (a) divalent radicals of the formula ##SPC11## ##SPC12## and (b) divalent organic radicals of the general formula ##SPC13## where X is a member selected from the class consisting of divalent radicals of the formulas ##EQU1## where m is 0 or 1, y is a whole number from 1 to 5, and R' is a phenyl radical or an alkyl radical of from 1 to 2 carbon atoms, the said reaction being conducted in a solvent selected from the class consisting of dimethyl sulfoxide, N,N-dimethyl formamide, N,N-dimethyl acetamide, N-methyl-pyrrolidone, and mixtures of such solvents and in the presence of a solid alkali-metal fluoride selected from the class consisting of cesium, potassium and rubidium fluorides, and mixtures thereof, and (2) isolating the formed aromatic bisimide.
Claim 2
Dependent Claim
171 words
The process for making aromatic imides of the general formula ##SPC9## which comprises (1) effectin reaction under substantially anhydrous conditions between a fluorophthalimide of the general formula ##SPC10## with a dihydroxy compound of the general formula HO-R-OH where R is a member selected from the class consisting of (a) divalent radicals of the formula ##SPC11## ##SPC12## and (b) divalent organic radicals of the general formula ##SPC13## where X is a member selected from the class consisting of divalent radicals of the formulas ##EQU1## where m is 0 or 1, y is a whole number from 1 to 5, and R' is a phenyl radical or an alkyl radical of from 1 to 2 carbon atoms, the said reaction being conducted in a solvent selected from the class consisting of dimethyl sulfoxide, N,N-dimethyl formamide, N,N-dimethyl acetamide, N-methyl-pyrrolidone, and mixtures of such solvents and in the presence of a solid alkali-metal fluoride selected from the class consisting of cesium, potassium and rubidium fluorides, and mixtures thereof, and (2) isolating the formed aromatic bisimide.
Claim 3
Dependent Claim
11 words
The process as in claim 1 wherein the fluorophthalimide is 4-fluoro-N-methylphthalimide.
Claim 4
Dependent Claim
12 words
The process as in claim 1 wherein the dihydroxy compound is bisphenol-A.
Claim 5
Dependent Claim
13 words
The process as in claim 1 wherein the alkali-metal fluoride is potassium fluoride.
Claim 6
Dependent Claim
13 words
The process as in claim 1 wherein the alkali-metal fluoride is cesium fluoride.
Claim 7
Dependent Claim
12 words
The process as in claim 1 wherein the solvent is N,N-dimethyl formamide.
Claim 8
Dependent Claim
40 words
The process for making a bisimide having the formula ##SPC14## which comprises effecting reaction under substantially anhydrous conditions between 4-fluoro-N-methylphthalimide and bisphenol-A in the presence of solid potassium fluoride using N,N-dimethyl formamide as the solvent, and isolating the formed bisimide.
Claim 9
Dependent Claim
40 words
The process for making a bisimide having the formula ##SPC14## which comprises effecting reaction under substantially anhydrous conditions between 4-fluoro-N-methylphthalimide and bisphenol-A in the presence of solid potassium fluoride using N,N-dimethyl formamide as the solvent, and isolating the formed bisimide.
Claim 10
Dependent Claim
23 words
The process as in claim 1 wherein at least 2 mols of the alkali-metal fluoride are employed per mol of the dihydroxy compound.
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) | 1979-11-16 | 1980-05-17 | 1980-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-16 | 1984-05-17 | 1984-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-16 | 1988-05-17 | 1988-11-16 | $7700.00 | Window Closed / Lapsed |