US4428887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing mono-substituted terminal diesters
Assignee: Monsanto Co
•
Filing: 1982-07-14
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Granted: 1984-01-31
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Expires: 2002-07-14
Abstract
Abstract Mono-substituted terminal diesters of malonic acid are prepared by reaction of the corresponding substituted 1,2-diesters with alkali metal hydride in the presence of organic solvent medium.
Inventors
- 👤 Jacob S. Tou
- 👤 Alfred A. Schleppnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:15
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
72 words
A method for the preparation of mono-substituted terminal diesters of malonic acid having the structure ##STR18## comprising reacting the corresponding substituted 1,2-diesters of the structure ##STR19## with alkali metal hydride in the presence of organic solvent medium, wherein: alkali metal=Na, K, Li; X=CN, CO 2 R, CO 2 R 1 ; R and R 1 =C 1-4 alkyl; R 2 =C 1-6 alkyl, alkenyl, alkynyl; benzyl and C 1-4 alkyl substituted benzyl.
Claim 2
Independent Claim
72 words
A method for the preparation of mono-substituted terminal diesters of malonic acid having the structure ##STR18## comprising reacting the corresponding substituted 1,2-diesters of the structure ##STR19## with alkali metal hydride in the presence of organic solvent medium, wherein: alkali metal=Na, K, Li; X=CN, CO 2 R, CO 2 R 1 ; R and R 1 =C 1-4 alkyl; R 2 =C 1-6 alkyl, alkenyl, alkynyl; benzyl and C 1-4 alkyl substituted benzyl.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein: R=R 1 =CH 3 , C 2 H 5 .
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the alkali metal hydride is KH.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the organic solvent medium is 1,2-dimethoxyethane.
References Cited (Backward Citations)
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US1954429A
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US2153730A
Cited
US2872448A
Cited
US2876225A
Cited
GB940533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |