US3657352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of tertiary phosphine oxides
Assignee: Hoechst AG
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Filing: 1970-03-04
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Granted: 1972-04-18
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Expires: 1990-03-04
Abstract
Abstract IMPROVED PROCESS FOR THE PREPARATION OF TERTIARY PHOSPHINE OXIDES BY REACTING DIALKYL PHOSPHINE OXIDES WITH A-OLEFINS WHEREIN THE REACTION IS CARRIED OUT UNDER AN ATMOSPHERE OF AN INERT GAS WITH EXPOSURE TO ULTRAVIOLET LIGHT, IN THE PRESENCE OF CATALYTICAL AMOUNTS OF FREE RADICAL-FORMING AGENTS OR IN THE ABSENCE OF THESE CATALYTICAL MEASURES AT A TEMPERATURE BETWEEN 130* AND 200*C. IN COMPARISON TO KNOWN PROCESSES THE TERTIARY PHOSPHINE OXIDES ARE OBTAINED WITHIN A SHORTER REACTION TIME, WITH HIGHER PURITY AND IN HIGHER YIELDS. THE REACTION PRODUCTS CAN BE USED AS INTERMEDIATES, SURFACTANTS, DETERGENTS AND CLEANING AGENTS, ESPECIALLY IN COSMETIC PRODUCTS.
Inventors
- 👤 Hans-Jerg Kleiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:50
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/66; C11D1/79; A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/55; A61Q; A61Q17/00; A61Q19/00; A61Q19/10; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53; C07F9/5304
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |