Patent US4267329A successfully refreshed from Google Patents.
US4267329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of 2-vinylpyridine from acetylene and acrylonitrile
Assignee: Studiengesellschaft Kohle gGmbH
•
Filing: 1980-06-02
•
Granted: 1981-05-12
•
Expires: 2000-06-02
Abstract
Abstract A process is described for the catalytic, selective preparation of 2-vinylpyridine from acetylene and acrylonitrile using a cyclopentadienylcobalt catalyst or π-allylcobalt catalyst at elevated temperature in an inert solvent, wherein the acrylonitrile concentration is up to 2 mols/liter and the reaction is carried out at a temperature over 140° C. and up to 180° C., the reaction time being not more than 50 minutes.
Inventors
- 👤 Helmut Bonnemann
- 👤 Marc Samson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:36
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/08; C07F; C07F15/00; C07F15/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
2 words
π-indenyl (cycloocta-1,5-diene)cobalt.
Claim 2
Dependent Claim
2 words
π-indenyl (cycloocta-1,5-diene)cobalt.
Claim 3
Dependent Claim
1 words
π-trimethylsilylcyclopentadienyl(cycloocta-1,5-diene)cobalt.
Claim 4
Dependent Claim
1 words
π-trimethylsilylcyclopentadienyl(cycloocta-1,5-diene)cobalt.
Claim 5
Dependent Claim
1 words
π-cyclopentadiene-α,α'-bipyridylcobalt.
Claim 6
Dependent Claim
1 words
π-cyclopentadiene-α,α'-bipyridylcobalt.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |