US4358412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of vinyl ethers
Assignee: Dow Chemical Co
•
Filing: 1980-06-11
•
Granted: 1982-11-09
•
Expires: 2000-06-11
Abstract
Abstract The invention relates to a process to produce compounds represented by the general formula Y--(CFR.sub.f).sub.a --(CFR.sub.f ').sub.b --O--CF═CF.sub.2 by decarboxylation of compounds represented by the general formula ##STR1## where a=0-3; b=0-3; provided a+b=2 or 3; Y═an acid derivative; X═Cl, I, or Br; M═OR, F, Cl, Br, I, OA; A═alkali metal, alkali earth metal, a quaternary nitrogen and hydrogen; R f ' and R f are independently selected from the group consisting of F, Cl, perfluoroalkyls and fluorochloroalkyls R═an alkyl having one or more carbon atoms or an aryl.
Inventors
- 👤 Bobby R. Ezzell
- 👤 William P. Carl
- 👤 William A. Mod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:39
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/14; C07C43/15; C07C43/16; C07C309/00; C07C59/00; C07C59/125; C07C59/135; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A method of preparing compounds represented by the general formula: Y(CFR.sub.f).sub.a --(CFR'.sub.f).sub.b --O--CF═CF.sub.2 which comprises decarboxylating ##STR34## in the presence of an activator when M═OR, F, Cl, Br or I and at a temperature of from about 50° C. to about 600° C. for a time sufficient for said decarboxylation to occur where: ##STR35## R f ' and R f are independently selected from the group consisting of F, Cl, perfluoroalkyl radicals and fluorochloroalkyl radicals; Z=OR, F, Cl, Br or I; a=0-3; b=0-3; a+b=2 or 3; M=OR, F, Cl, Br, I or OA; A is selected from the group consisting of alkali metals, alkali earth metals, quaternary nitrogen and hydrogen; and R=an alkyl containing one or more carbon atoms or an aryl.
Claim 2
Independent Claim
122 words
A method of preparing compounds represented by the general formula: Y(CFR.sub.f).sub.a --(CFR'.sub.f).sub.b --O--CF═CF.sub.2 which comprises decarboxylating ##STR34## in the presence of an activator when M═OR, F, Cl, Br or I and at a temperature of from about 50° C. to about 600° C. for a time sufficient for said decarboxylation to occur where: ##STR35## R f ' and R f are independently selected from the group consisting of F, Cl, perfluoroalkyl radicals and fluorochloroalkyl radicals; Z=OR, F, Cl, Br or I; a=0-3; b=0-3; a+b=2 or 3; M=OR, F, Cl, Br, I or OA; A is selected from the group consisting of alkali metals, alkali earth metals, quaternary nitrogen and hydrogen; and R=an alkyl containing one or more carbon atoms or an aryl.
Claim 3
Dependent Claim
19 words
The method of claim 1 where Y is SO 2 Z, Z═F, R f ═R f '═F, and X═Cl.
Claim 4
Dependent Claim
14 words
The method of claim 1 where ##STR36## R f ═R f '═F and X═Cl.
Claim 5
Dependent Claim
14 words
The method of claim 1 where Y═PO(OR) 2 , R f ═R f '═F.
Claim 6
Dependent Claim
17 words
The method of claim 1 where Y═SO 2 F, R f ═R f '═F, X═Cl and a+b=2.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein decarboxylation is carried out in the presence of an activator when M═OA.
Claim 8
Dependent Claim
20 words
The method of claim 1 where the activator is selected from the group consisting of sodium carbonate, ZnO and silica.
Claim 9
Dependent Claim
11 words
The method of claim 7 where the activator is sodium carbonate.
Claim 10
Dependent Claim
13 words
The method of claim 1 carried out in the presence of a dispersant.
Claim 11
Dependent Claim
23 words
The method of claim 9 where the dispersant is selected from the group consisting of tetraglyme, diglyme, glyme and a sodium carbonate slurry.
Claim 12
Dependent Claim
23 words
The method of claim 1 wherein the decarboxylation is carried out at a temperature of from about 50° C. to about 150° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |