US3277178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aldehydes from acid halides
Assignee: Individual
•
Filing: 1962-02-27
•
Granted: 1966-10-04
•
Expires: 1982-02-27
Abstract
No abstract record available.
Inventors
- 👤 Herbert C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:00
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/41; C07C201/00; C07C201/06; C07C201/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A METHOD FOR REDUCING A CARBOXYLIC ACID HALIDE WHICH COMPRISES SUBJECTING THE ACID HALIDE TO THE REDUCING ACTION OF AN ALKALI METAL BOROHYDRIDE IN AN ETHER REACTION MEDIUM IN WHICH THE ACID HALIDE AND THE ALKALI METAL BOROHYDRIDE ARE AT LEAST PARTIALLY SOLUBLE, THE IMPROVEMENT WHEREIN THE REDUCTION IS CONDUCTED IN THE PRESENCE OF A TERTIARY AMINE WHICH IS AT LEAST PARTIALLY SOLUBLE IN THE REACTION MEDIUM AND WHICH IS CAPABLE OF FORMING A TABLE AMINE BORANE THEREBY FORMING A REACTION IXTURE COMPRISING AN ALDEHYDE CORRESPONDING TO SAID ACID HALIDE AND A BORANE CORRESPONDING TO SAID TERTIARY AMINE, AND SEPARATING SAID ALDEHYDE FROM THE REACTION MIXTURE, SAID ACID HALIDE, BOROHYDRIDE AND TERTIARY AMINE BEING USED IN SUBSTANTIALLY EQUIMOLAR PROPORTIONS, THE TEMPERATURE USED BEING BETWEEN ABOUT MINUS 78*C. AND 0*C.
Claim 2
Dependent Claim
130 words
IN A METHOD FOR REDUCING A CARBOXYLIC ACID HALIDE WHICH COMPRISES SUBJECTING THE ACID HALIDE TO THE REDUCING ACTION OF AN ALKALI METAL BOROHYDRIDE IN AN ETHER REACTION MEDIUM IN WHICH THE ACID HALIDE AND THE ALKALI METAL BOROHYDRIDE ARE AT LEAST PARTIALLY SOLUBLE, THE IMPROVEMENT WHEREIN THE REDUCTION IS CONDUCTED IN THE PRESENCE OF A TERTIARY AMINE WHICH IS AT LEAST PARTIALLY SOLUBLE IN THE REACTION MEDIUM AND WHICH IS CAPABLE OF FORMING A TABLE AMINE BORANE THEREBY FORMING A REACTION IXTURE COMPRISING AN ALDEHYDE CORRESPONDING TO SAID ACID HALIDE AND A BORANE CORRESPONDING TO SAID TERTIARY AMINE, AND SEPARATING SAID ALDEHYDE FROM THE REACTION MIXTURE, SAID ACID HALIDE, BOROHYDRIDE AND TERTIARY AMINE BEING USED IN SUBSTANTIALLY EQUIMOLAR PROPORTIONS, THE TEMPERATURE USED BEING BETWEEN ABOUT MINUS 78*C. AND 0*C.
References Cited (Backward Citations)
US2645636A
Cited
US2678949A
Cited
US2810760A
Cited
US2806883A
Cited
US2971031A
Cited
US2807614A
Cited
US2811557A
Cited
US2875248A
Cited
US3051754A
Cited
US2916518A
Cited
US2997485A
Cited
US2993895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |