Patent US4049698A successfully refreshed from Google Patents.
US4049698A
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Process for producing methylene malonic esters
Assignee: Permabond International Corp
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Filing: 1976-08-05
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Granted: 1977-09-20
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Expires: 1996-08-05
Abstract
Abstract A process comprising A. reacting an ester of malonic acid having the formula ##STR1## with formaldehyde and a diene having the formula ##STR2## in the presence of an amine catalyst at about reflux temperature to form a compound having the formula ##STR3## wherein R 1 and R 2 are the same or different and each represents alkyl of 1 to about 10 carbon atoms, cyclohexyl or alkenyl of 2 to about 4 carbon atoms and each R 3 is the same or different and represents hydrogen, methyl or ethyl.
Inventors
- 👤 Gary Fred Hawkins
- 👤 Robert Lee Gass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:14
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/70
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
A process comprising A. reacting an ester of malonic acid having the formula ##STR12## with formaldehyde and a diene having the formula ##STR13## in the presence of a catalyst selected from primary, secondary and tertiary amines at about reflux temperature to form a compound having the formula ##STR14## wherein R 1 and R 2 are the same or different and each represents alkyl of 1 to about 10 carbon atoms, cyclohexyl or alkenyl of 2 to about 4 carbon atoms and each R 3 is the same or different and represents hydrogen, methyl or ethyl.
Claim 2
Dependent Claim
95 words
A process comprising A. reacting an ester of malonic acid having the formula ##STR12## with formaldehyde and a diene having the formula ##STR13## in the presence of a catalyst selected from primary, secondary and tertiary amines at about reflux temperature to form a compound having the formula ##STR14## wherein R 1 and R 2 are the same or different and each represents alkyl of 1 to about 10 carbon atoms, cyclohexyl or alkenyl of 2 to about 4 carbon atoms and each R 3 is the same or different and represents hydrogen, methyl or ethyl.
Claim 3
Dependent Claim
12 words
Process of claim 1 wherein the catalyst is a secondary aliphatic amine.
Claim 4
Dependent Claim
9 words
Process of claim 2 wherein the catalyst is piperidine.
Claim 5
Dependent Claim
13 words
Process of claim 3 wherein the ester of malonic acid is dimethyl malonate.
Claim 6
Dependent Claim
13 words
Process of claim 3 wherein the ester of malonic acid is methyl allyl.
Claim 7
Dependent Claim
13 words
Process of claim 3 wherein the ester of malonic acid is methyl ethyl.
Claim 8
Dependent Claim
14 words
Process of claim 3 wherein the ester of malonic acid is methyl methoxy ethyl.
Claim 9
Dependent Claim
16 words
A compound having the formula ##STR15## wherein R 1 is allyl and R 2 is methyl.
Claim 10
Dependent Claim
16 words
A compound having the formula ##STR15## wherein R 1 is allyl and R 2 is methyl.
References Cited (Backward Citations)
US2264354A
Cited
US2212506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |