Method for preparing β-phosphorus nitroxide radicals
US7126021B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Dec 7, 2001 |
| Grant date | Oct 24, 2006 |
| Priority date | — |
| Expiry date | Oct 29, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/4006
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of β-phosphorated nitroxide radicals which consist in preparing, in a first step, an aminophosphonate by reaction of a carbonyl compound, of a primary amine and of a phosphorous compound in the presence of a Lewis acid and then, in a second step, in oxidizing the said crude aminophosphonate using nonhalogenated organic peracids in a water/organic solvent two-phase medium with an aqueous phase buffered at a pH ranging from 5 to 12.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.