US4052457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3,7,11,11-Tetramethyl-spiro-[5,5]undeca-8-ene-1-one
Assignee: Takasago International Corp
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Filing: 1975-12-02
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Granted: 1977-10-04
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Expires: 1995-12-02
Abstract
Abstract A novel spiro compound, 3,7,11,11-tetramethyl-spiro[5,5]-undeca-8-ene-1-one for altering the flavor or aroma of tobacco products. The spiro compound is prepared by reacting pulegone and piperylene in a solvent in the presence of a Lewis acid catalyst.
Inventors
- 👤 Akira Nagakura
- 👤 Michio Moroe
- 👤 Yasuto Koyama
- 👤 Haruki Kurihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:04
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/587; C07C49/613; C07C49/617; C07C49/623; A; A24; A24B; A24B15/00; A24B15/18; A24B15/28; A24B15/30; A24B15/34; A24B15/345; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/69
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
1 words
3,7,11,11-tetramethyl-spiro[5,5]undeca-8-ene-1-one.
Claim 2
Dependent Claim
1 words
3,7,11,11-tetramethyl-spiro[5,5]undeca-8-ene-1-one.
Claim 3
Dependent Claim
26 words
A process of producing 3,7,11,11-tetramethyl-spiro-[5,5]undeca-8-ene-1-one which comprises reacting pulegone and piperylene in an inert solvent under Diels-Alder reaction conditions in the presence of a Lewis-acid catalyst.
Claim 4
Dependent Claim
26 words
A process of producing 3,7,11,11-tetramethyl-spiro-[5,5]undeca-8-ene-1-one which comprises reacting pulegone and piperylene in an inert solvent under Diels-Alder reaction conditions in the presence of a Lewis-acid catalyst.
Claim 5
Dependent Claim
17 words
The process of claim 2 wherein the amount of pulegone is 1-4 moles per mole of piperylene.
Claim 6
Dependent Claim
23 words
The process of claim 2 wherein said solvent is selected from the group consisting of dichloromethane, carbon tetrachloride, chloroform, benzene, toluene, or n-hexane.
Claim 7
Dependent Claim
32 words
The process of claim 2 wherein the reaction is carried out for 10-48 hours at room temperature to the refluxing temperature of the system in the presence of a Lewis acid catalyst.
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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |