US3715400A
Expired / Lapsed
US
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Synthesis of hydroxycyclopenten-1-ones
Assignee: F Hoffmann La Roche AG
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Filing: 1969-05-09
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Granted: 1973-02-06
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Expires: 1989-05-09
Abstract
Abstract This invention relates to a process for the preparation of 2alkenyl-4-hydroxy-3-methyl-2-cyclopenten-1-ones from a 2-alkenyl or 2-alkynyl-3-methyl-2-cyclopenten-1-one and intermediates therein.
Inventors
- 👤 R Kierstead
- 👤 R Lemahieu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:37
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/587; C07C49/703; C07C49/743; C07C35/00; C07C35/02; C07C35/06; C07C45/00; C07C45/27; C07C45/28; C07C45/29; C07C45/292; C07C45/32; C07C45/33; C07C45/34; C07C45/61; C07C45/62; C07C45/64; C07C45/67; C07C45/68; C07C45/72; C07C49/527; C07C49/537; C07C49/647; Y; Y10; Y10S; Y10S424/00; Y10S424/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
5 words
A compound of the formula:
Claim 2
Dependent Claim
5 words
A compound of the formula:
Claim 3
Dependent Claim
10 words
The compound of claim 1 wherein said compound is 2-(2''-cis-butenyl)-3-methyl-2-cyclopenten-1,4-dione.
Claim 4
Dependent Claim
10 words
The compound of claim 1 wherein said compound is 2-(2''-propenyl)-3-methyl-2-cyclopenten-1,4-dione.
Claim 5
Dependent Claim
10 words
The compound of claim 1 wherein said compound is 2-(2''-propynyl)-3-methyl-2-cyclopenten-1,4-dione.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |