Patent US4229353A successfully refreshed from Google Patents.
US4229353A
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(2,2-Disubstituted vinyl)γ-butyrolactones
Assignee: Cheminova AS
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Filing: 1979-04-03
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Granted: 1980-10-21
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Expires: 1999-04-03
Abstract
Abstract (2,2-Disubstituted vinyl)-γ-butyrolactones of the formula: ##STR1## in which R 1 and R 2 are hydrogen or C 1 -C 6 alkyl, preferably methyl, R 3 and R 4 are hydrogen, C 1 -C 6 alkyl, preferably methyl, or halogen, or, together with the carbon atom to which they are attached, form a cycloalkyl group, and R 5 is C 1 -C 6 alkyl, are prepared by condensing an epoxide of the formula: ##STR2## with a malonic acid ester of the formula: ##STR3## in a basic medium. The butyrolactones of formula I are valuable intermediates for the synthesis of synthetic pyrethroids having insecticidal activity.
Inventors
- 👤 Per D. Klemmensen
- 👤 Hans Kolind-Andersen
- 👤 Hans B. Madsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:26
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33; C07C; C07C17/00; C07C17/35; C07C17/358; C07C17/361; C07C17/363; C07D303/00; C07D303/02; C07D303/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
18 words
A (2,2-Disubstituted Vinyl)-γ-butyrolactone of the formula: ##STR16## in which R 5 is C 1 or C 2 alkyl.
Claim 2
Dependent Claim
18 words
A (2,2-Disubstituted Vinyl)-γ-butyrolactone of the formula: ##STR16## in which R 5 is C 1 or C 2 alkyl.
Claim 3
Dependent Claim
13 words
A (2,2-Disubstituted vinyl)-γ-butyrolactone as defined in claim 1 wherein R 5 is methyl.
Claim 4
Dependent Claim
13 words
A (2,2-Disubstituted vinyl)-γ-butyrolactone as defined in claim 1 wherein R 5 is ethyl.
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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |