Patent US3623966A successfully refreshed from Google Patents.
US3623966A
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Photodimerization of acrylonitrile
Assignee: Phillips Petroleum Co
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Filing: 1970-03-05
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Granted: 1971-11-30
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Expires: 1990-03-05
Abstract
Abstract Acrylonitrile is photodimerized to 1,2-dicyanocyclobutane in the presence of an activator of Mo(CO)6 or W(CO)6. Preferably, a promoter such as triphenylphosphine is employed in combination with the activator.
Inventors
- 👤 William B Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:09
CPC Classifications
C; C07; C07C; C07C255/00; C07C255/45; Y; Y10; Y10S; Y10S204/00; Y10S204/902; Y10S204/908
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
A process according to claim 1 wherein said activator is the reaction product of acrylonitrile and molybdenum hexacarbonyl or tungsten hexacarbonyl.
Claim 2
Dependent Claim
66 words
A process according to claim 1 wherein said contacting is carried out in the presence of a promoter represented by the formulas: R3P; (RO)3P or R2P-R''-R2P wherein R is an aromatic or saturated aliphatic radical having from one to 20 carbon atoms, R'' is an alkylene radical having from one to three carbon atoms and at least one aromatic radical is present per molecule of promoter.
Claim 3
Dependent Claim
19 words
A process according to claim 3 wherein said promoter is triphenylphosphine, triphenylphosphite, 1,2-bis(diphenylphosphino)ethane, 1,2-bis(diphenylphosphino)propane, tri(4-methylphenyl)phosphine, tri(4-methylphenyl)phosphite, tri(4-t-butylphenyl)phosphine, or tri(4-t-butylphenyl)phosphite.
Claim 4
Dependent Claim
28 words
A process according to claim 3 wherein said promoter is triphenylphosphine or 1,2-bis(diphenylphosphino)ethane and said ultraviolet radiation has a wavelength in the range of 2,000 to 7,000 Angstroms.
Claim 5
Dependent Claim
29 words
A process according to claim 3 wherein hypophosphorus acid is employed with said promoter and said ultraviolet radiation has a wavelength in the range of 3,000 to 4,000 Angstroms.
Claim 6
Dependent Claim
74 words
A process according to claim 3 wherein said contacting is carried out at a temperature in the range of 0* to 50* C., under a pressure sufficient to maintain the reactants in substantially completely in the liquid phase and for a time in the range of 0.5 to 30 hours wherein the proportion of said activator to acrylonitrile is in the range of 0.5 to 25 parts of activator per 100 parts of acrylonitrile.
Claim 7
Dependent Claim
23 words
A process according to claim 3 wherein said activator can be supported on a high surface solid support of silica, alumina or silica-alumina.
Claim 8
Dependent Claim
37 words
A process according to claim 3 wherein said reacting is carried out in the presence of a substantially completely nonreactive diluent, wherein said diluent can comprise from 10 to 95 weight percent of the resulting reaction mixture.
Claim 9
Dependent Claim
11 words
A process according to claim 9 wherein said diluent is acetonitrile.
References Cited (Backward Citations)
US3483103A
Cited
US3475305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |