Formation of 1-phenylvinyl-1-phosphonic acid
US5391816A · kind A · utility
5Cited by
10References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Nov 8, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/3826
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for forming 1-phenylvinyl-1-phosphonic acid utilizes reacting a mixture of phosphorus trihalide, such as phosphorus trichloride, and acetophenone with water, under conditions in which the water is gradually added to the mixture with cooling to form a reaction mixture, which can be sparged of excess acetophenone with aqueous acid while under vacuum, comprising the 1-phenylvinyl-1-phosphonic acid. This product can be recovered from the reaction mixture by recrystallization from aqueous mineral acid, such as hydrochloric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.