Synthesis of tetraalkyl vinylidene diphosphonate monomer
US5442085A · kind A · utility
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2References
20Claims
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Key dates
| Filing date | Oct 5, 1993 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Oct 5, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/4031
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of making a monomer of tetraalkyl vinylidene-1, 1-diphosphonate. The monomer is manufactured by combining an aqueous secondary amine solution with a formaldehyde and a tetra (alkyl) methylene diphosphonate. The resulting mixture is maintained at a pH above about 6 and refluxed for two hours to enable reaction to produce the monomer of tetraalkyl vinylidene-1, 1-diphosphonate. The product monomer is then purified to produce the final end product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.