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US4237308A
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Process for preparing 2-cyclopentenone derivative and perfume composition containing the derivative
Assignee: Otsuka Kagaku Yakuhin KK
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Filing: 1978-06-08
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Granted: 1980-12-02
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Expires: 1998-06-08
Abstract
Abstract A process for preparing 2-cyclopentenone derivative represented by the formula ##STR1## wherein A is ##STR2## and R 2 is lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, and perfume composition containing the derivative.
Inventors
- 👤 Sigeru Torii
- 👤 Hideo Tanaka
- 👤 Yuichi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:32
CPC Classifications
C; C11; C11B; C11B9/00; C11B9/0026; C11B9/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A process for preparing a mixture of 2-cyclopentenone derivatives represented by the formulae: ##STR12## wherein R 2 is lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, comprising decarboxylating 5-(cis-2-pentenyl)-2-cyclopentenone derivative represented by the formula: ##STR13## wherein R 1 is branched-chain alkyl, and R 2 is as defined above in the presence of sodium chloride.
Claim 2
Dependent Claim
54 words
A process for preparing a mixture of 2-cyclopentenone derivatives represented by the formulae: ##STR12## wherein R 2 is lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, comprising decarboxylating 5-(cis-2-pentenyl)-2-cyclopentenone derivative represented by the formula: ##STR13## wherein R 1 is branched-chain alkyl, and R 2 is as defined above in the presence of sodium chloride.
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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |