US3681333A
Expired / Lapsed
US
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Process for the preparation of cyclic iminoethers
Assignee: Honeywell International Inc
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Filing: 1967-07-24
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Granted: 1972-08-01
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Expires: 1987-07-24
Abstract
Abstract The liquid phase thermally induced cyclodehydration of N-( omega -hydroxyalkyl) alkyl and aryl carboxylamides to afford cyclic iminoethers is catalyzed by compounds of manganese, cobalt, molybdenum, tungsten and the rare earth metals.
Inventors
- 👤 Morton H Litt
- 👤 Richard B Lund
- 👤 John Vitrone
- 👤 Jack L Herz
- 👤 Francis C O'donnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:32
CPC Classifications
C; C07; C07D; C07D265/00; C07D265/04; C07D265/06; C07D265/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
A process in accordance with claim 1 wherein n is 2 and R is ethyl.
Claim 2
Dependent Claim
25 words
A process in accordance with claim 1 wherein n is 3 and R is a member selected from the group consisting of methyl and ethyl.
Claim 3
Dependent Claim
41 words
A process in accordance with claim 1 wherein there is present in conjunction with said catalyst material an approximately equimolar amount of an inorganic base selected from the group consisting of alkali and alkaline earth metal oxides, hydroxides, carbonates and bicarbonates.
Claim 4
Dependent Claim
14 words
A process in accordance with claim 4 wherein said inorganic base is sodium bicarbonate.
Claim 5
Dependent Claim
24 words
A process in accordance with claim 1 wherein said heating is carried out at a sub-atmospheric pressure of below about 500 mm. of mercury.
Claim 6
Dependent Claim
25 words
A process in accordance with claim 1 wherein said heating is carried out at a temperature of from about 180* C. to about 250* C.
Claim 7
Dependent Claim
25 words
A process in accordance with claim 1 wherein said heating is effected in the presence of from 0.01 to 2 weight percent of catalyst material.
Claim 8
Dependent Claim
131 words
A process for the preparation of a cyclic iminoether having the formula wherein R represents a substituent selected from the group consisting of hydrogen and aliphatic, alicyclic and monocyclic aromatic hydrocarbons having up to 20 carbon atoms and jointed perfluoroalkylalkyl radicals of the structure CF3(CF2)r(CH2)s, wherein r and S range from 0 to 10 and the sum of r plus s is from 1 to 20 , and n is 2 or 3; comprising heating a hydroxyalkylamide having the formula wherein R and n are as defined above, at a temperature of from about 140* C. to about 300* C., in the presence of from 0.01 to 15 weight percent of catalyst material selected from the group consisting of molybdenum dioxide, phosphomolybdic acid, alkali metal tungstates and molybdates and didymium oxide.
Claim 9
Dependent Claim
1 words
2-(8,10-heptadecadienyl)-2-oxazoline.
References Cited (Backward Citations)
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US2530627A
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US2564423A
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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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |