Patent US4097538A successfully refreshed from Google Patents.
US4097538A
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US
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Dehydrochlorination of a dihydroxydiphenyl trichloroethane
Assignee: General Electric Co
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Filing: 1977-02-23
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Granted: 1978-06-27
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Expires: 1997-02-23
Abstract
Abstract 1,1,1-Trichloro-2,2-bis(4-hydroxyphenyl)ethane can be dehydrohalogenated to 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene by treating the former with liquid ammonia.
Inventors
- 👤 Arnold Factor
- 👤 Michael R. MacLaury
- 👤 Jimmy L. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:24
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/001; C07C37/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
The process for dehydrohalogenating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl) ethane to form the dichloroethylene compound of the formula ##STR8## which process comprises (1) treating the aforesaid trichloroethane with from 3 to 20 moles anhydrous liquid ammonia per mole trichloroethane thereby to form a substantially pure dichloroethylene compound of the above formula, (2) removing unreacted ammonia, (3) dissolving the reaction product in an amount of a methanol/water mixture whose pH has been adjusted to from 3 to 11 sufficient to dissolve both the formed ammonium chloride and the aforesaid dichloroethylene compound, (4) heating the mixture of ingredients and then allowing the mixture to cool until precipitation of the dichloroethylene compound is accomplished and (5) isolating the precipitated dichloroethylene compound.
Claim 2
Dependent Claim
114 words
The process for dehydrohalogenating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl) ethane to form the dichloroethylene compound of the formula ##STR8## which process comprises (1) treating the aforesaid trichloroethane with from 3 to 20 moles anhydrous liquid ammonia per mole trichloroethane thereby to form a substantially pure dichloroethylene compound of the above formula, (2) removing unreacted ammonia, (3) dissolving the reaction product in an amount of a methanol/water mixture whose pH has been adjusted to from 3 to 11 sufficient to dissolve both the formed ammonium chloride and the aforesaid dichloroethylene compound, (4) heating the mixture of ingredients and then allowing the mixture to cool until precipitation of the dichloroethylene compound is accomplished and (5) isolating the precipitated dichloroethylene compound.
Claim 3
Dependent Claim
27 words
The process as in claim 1 wherein the dehydrohalogenation step is carried out under superatmospheric pressure and at a temperature of from about 10° to 125° C.
Claim 4
Dependent Claim
19 words
The process as in claim 1 wherein the treatment with the methanol/water mixture is at a pH below 7.
References Cited (Backward Citations)
GB1147258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |