US3622641A
Expired / Lapsed
US
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Dehydrohalogenation of halogenated compounds
Assignee: EIDP Inc
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Filing: 1968-02-28
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Granted: 1971-11-23
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Expires: 1988-02-28
Abstract
Abstract Halogen-containing organic compounds are treated with aqueous inorganic alkaline material in the presence of a catalytic amount of cyclic polyether to split off hydrogen halide.
Inventors
- 👤 James Walter Crary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:04
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/25; C07D; C07D323/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
11 words
The process of claim 1 wherein the cyclic polyether is 2,3-benzo-1,4,7,10,13-pentaoxacyclopentadec-2-ene.
Claim 2
Dependent Claim
12 words
The process of claim 1 wherein the cyclic polyether is 2,5,8, 11,14-pentaoxabicyclo(13.4.0)nonadecane.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the cyclic polyether is 15-tert-butyl-2,3-benzo-1,4,7,10,13-pentaoxacyclopentadec-2-ene.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the cyclic polyether catalyst is 17-tert-butyl-2,5,8,11,14-pentaoxabicyclo-(13.4.0)-nonadecane.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the cyclic polyether catalyst is 2,5,8,15,18,21-hexaoxatricyclo(20.4.0.09.14)-hexacosane.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein said chlorinated compound is 3,4-dichloro-1-butene.
Claim 7
Dependent Claim
22 words
The process of claim 10 wherein said dehydrohalogenation is carried out at a temperature of from about 40* to about 85* C.
Claim 8
Dependent Claim
21 words
The process of claim 10 wherein the mole ratio of alkali metal hydroxide to 3,4-dichloro-1-butene ranges from about 0.5:1 to 20:1.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |