US3819733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of nonconjugated dienic grignard reagents and their utilization in organic syntheses
Assignee: Syensqo USA LLC
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Filing: 1972-03-06
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Granted: 1974-06-25
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Expires: 1992-03-06
Abstract
Abstract A PROCESS IS PROVIDED FOR THE PREPARATION OF NONCONJUGATED DIENIC GRIGNARD REAGENTS WHICH ARE USEFUL IN ORGANIC SYNTHESES AND PARTICULARLY FOR THE PREPARATION OF COMPLEX TERPENIC ALCOHOLS, SUCH AS LAVANDULOL. A MONO CONJUGATED DIENE MAGNESIUM COMPOUND AND AN ALKYL HALIDE ARE REACTED IN THE PRESENCE OF A CYCLIC ETHER TO FORM THE NONCONJUGATED DIENIC GRIGNARD REAGENT. TO FORM A TERPENIC ALCOHOL SUCH AS LAVANDULOL, A MONO DIENE MAGNESIUM SUCH AS ISOPRENE MAGNESIUM AND A DIENE HYDROHALIDE SUCH AS PRENYL HALIDE ARE REACTED, AND THE RESULTING GRIGNARD REAGENT IS THEN TREATED WITH OXYGEN AND HYDROLYZED, TO FORM, FOR EXAMPLE, LAVANDULOL.
Inventors
- 👤 H Ramsden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:02
CPC Classifications
C; C07; C07F; C07F3/00; C07F3/02; C07C; C07C29/00; C07C29/48; C07C29/50; C07C29/54
Claims Analysis
Total Claims: 0
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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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |