US3974159A
Expired / Lapsed
US
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Manufacture of derivatives of malondialdehyde
Assignee: BASF SE
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Filing: 1975-04-28
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Granted: 1976-08-10
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Expires: 1995-04-28
Abstract
Abstract Compounds of the general formula ##EQU1## which may be used in place of malondialdehyde in synthesis reactions are obtained in a one-step reaction form dimethylformamide, phosgene and an alkyl vinyl ether.
Inventors
- 👤 Martin Decker
- 👤 Willibald Schoenleben
- 👤 Herbert Toussaint
- 👤 Hewig Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:34
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/32; C07D239/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
A process for the manufacture of a malondialdehyde derivative of the general formula ##EQU2## where R 1 is alkyl of up to 8 carbon atoms, R 2 is hydrogen or alkyl or alkoxy of up to 20 carbon atoms, and R 3 and R 4 are identical or different alkyl or, together with nitrogen to which they are attached, form a heterocyclic ring of up to 7 members, by reaction of phosgene with a dialkylformamide of the general formula ##EQU3## to give the dialkylformamide chloride and reaction of the dialkylformamide chloride with an enol ether (vinyl ether) of the general formula R.sup.2 --CH=CH--OR.sup.1 R 1 , r 2 , r 3 and R 4 having the above meanings, in which process the reactions are allowed to take place simultaneously.
Claim 2
Dependent Claim
129 words
A process for the manufacture of a malondialdehyde derivative of the general formula ##EQU2## where R 1 is alkyl of up to 8 carbon atoms, R 2 is hydrogen or alkyl or alkoxy of up to 20 carbon atoms, and R 3 and R 4 are identical or different alkyl or, together with nitrogen to which they are attached, form a heterocyclic ring of up to 7 members, by reaction of phosgene with a dialkylformamide of the general formula ##EQU3## to give the dialkylformamide chloride and reaction of the dialkylformamide chloride with an enol ether (vinyl ether) of the general formula R.sup.2 --CH=CH--OR.sup.1 R 1 , r 2 , r 3 and R 4 having the above meanings, in which process the reactions are allowed to take place simultaneously.
Claim 3
Dependent Claim
50 words
A process as claimed in claim 1, wherein the reactions are carried out continuously, at least 50% of the conversion being achieved in a reaction space which permits controllable back-mixing, and the remaining conversion (if any) being carried out in a reaction vessel in which essentially no back-mixing takes place.
Claim 4
Dependent Claim
27 words
A process as claimed in claim 1, wherein the reaction is carried out in the essentially complete absence of solvents which do not participate in the reaction.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |