US4113739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of (poly)cyclic polyethers
Assignee: Dow Chemical Co
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Filing: 1974-01-28
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Granted: 1978-09-12
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Expires: 1994-01-28
Abstract
Abstract In the preparation of (poly)cyclic polyethers by a cyclic Williamson synthesis, the improvement of contacting the reactants in a hindered (C 4 -C 14 ) alkanol. For example, bis-chloroethyl ether and the disodium salt of tetraethylene glycol are contacted in t-butanol to produce the cyclic polyether ##STR1## in high yields.
Inventors
- 👤 Roger O. Trucks
- 👤 Edwin C. Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:52
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10; C07D323/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
In the process of preparing (poly)cyclic polyethers by: (a) autocondensing a polyoxyalkylene α,ω-halohydrin in the presence of a strong alkali metal base; (b) condensing, by contacting, a (poly)oxyalkylene α,ω-diol with an alkylene or a (poly)oxyalkylene α,ω-dihalide in the presence of a strong alkali metal base; or (c) condensing, by contacting, the dialkali metal salt of a (poly)oxyalkylene α,ω-diol with an alkylene or a (poly)oxyalkylene α,ω-dihalide; the improvement of effecting the preparation in a hindered alkanol or hindered alkanol mixture the alkanol(s) having from 4 to about 14 carbon atoms.
Claim 2
Dependent Claim
89 words
In the process of preparing (poly)cyclic polyethers by: (a) autocondensing a polyoxyalkylene α,ω-halohydrin in the presence of a strong alkali metal base; (b) condensing, by contacting, a (poly)oxyalkylene α,ω-diol with an alkylene or a (poly)oxyalkylene α,ω-dihalide in the presence of a strong alkali metal base; or (c) condensing, by contacting, the dialkali metal salt of a (poly)oxyalkylene α,ω-diol with an alkylene or a (poly)oxyalkylene α,ω-dihalide; the improvement of effecting the preparation in a hindered alkanol or hindered alkanol mixture the alkanol(s) having from 4 to about 14 carbon atoms.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the hindered alkanol employed is t-butanol, t-amyl alcohol or neopentyl alcohol.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the hindered alkanol is t-butanol.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein a polyoxyalkylene α,ω-halohydrin comprising from about 4 to about 10 lower oxyalkylene units is cyclized by autocondensation.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein the lower oxyalkylene units are oxyethylene or oxypropylene units.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein a polyoxyethylene- or polyoxypropylene-α,ω-chlorohydrin is employed and the hindered alkanol is t-butanol.
Claim 8
Dependent Claim
31 words
The process of claim 1 wherein a (poly)oxyalkylene α,ω-diol or its dialkali metal salt comprising from 2 to about 9 lower oxyalkylene units is contacted with an alkylene or (poly)oxyalkylene α,ω-dihalide.
Claim 9
Dependent Claim
26 words
The process of claim 7 wherein the alkylene or (poly)oxyalkylene α,ω-dihalide is selected from the group consisting of: ethylene α,ω-dihalides; propylene α,ω-dihalides; 3,3-bis(halomethyl)oxetanes; 2,2-bis(halomethyl)-1,3-dioxolanes; and 5,5-bis(halomethyl)-1,3-dioxanes.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein 3,3-bis(bromomethyl)oxetane is employed as the alkylene α,ω-dihalide.
Claim 11
Dependent Claim
38 words
The process of claim 9 wherein an α,ω-disodium salt of (poly)ethylene or (poly)propylene glycol of 2 to about 9 oxyethylene or oxypropylene units is employed as the (poly)oxyalkylene α,ω-diol dialkali metal salt and the hindered alkanol is t-butanol.
Claim 12
Dependent Claim
21 words
The process of claim 3 wherein the polycyclic polyether is prepared by contacting the disodium salt of triethylene glycol with 3,3-bis(bromomethyl)oxetane.
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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |