Method for preparing .beta.-phosphorus nitroxide radicals
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United States of America Patent
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Oct 24, 2006
Grant Date -
Apr 22, 2004
app pub date -
Dec 7, 2001
filing date -
Dec 11, 2000
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Abstract
The present invention relates to a process for the preparation of .beta.-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.
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