US3714246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of 1-halo-3-methyl and 1-halo-2,4-dimethyl-phospholenes
Assignee: Pharmacia and Upjohn Co
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Filing: 1971-06-01
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Granted: 1973-01-30
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Expires: 1991-06-01
Abstract
Abstract A PROCESS IS DISCLOSED FOR PREPARING 1-HALO-3-METHYLPHOSPHOLENES AND 1-HALO3,4-DIMETHYLPHOSPHOLENES; SAID HALO BEING SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE. THE PROCESS COMPRISES REACTING AN APPROPRIATE 1,1-DIHALOPHOSPHOLENIUM HALIDE WITH A HYDROCARBYL PHOSPHINE IN THE PRESENCE OF AN INERT ORGANIC SOLENT, AND AT A TEMPERATURE OF FROM 0*C. TO REFLUX TEMPERATURE. THE PRODUCTS OF THE PROCESS ARE USEFUL AS INTERMEDIATES IN A VARIETY OF CHEMICAL SYNTHESES. TOF EXAMPLE, THEY ARE EMPLOYED FOR THE PREPARATION OF SELECTIVE SOLVENTS, AND CATALYSTS FOR THE PREPARATION OF CARBODIMIDES FROM ISOCYANATES.
Inventors
- 👤 C Smith
- 👤 H Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:03
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6568
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |