Patent ID: 8394904

Claim:
A process for the preparation of alkoxyamines of formula (I): in which R represents a linear or branched alkyl radical having a number of carbon atoms ranging from 1 to 3 and R 1 represents a hydrogen atom, an alkali metal, NH 4 + , Bu 4 N + or Bu 3 NH + , by reaction of the nitroxide of formula (II): with a halocarbon compound of formula (III): in which X represents a chlorine, bromine or iodine atom, and R represents a linear or branched alkyl radical having a number of carbon atoms ranging from 1 to 3 and R 1 represents a hydrogen atom, an alkali metal, NH 4 + , Bu 4 N + or Bu 3 NH + , in the presence of an organometallic system MA(L) n and/or M(L) n (IV), in which M is a metal selected from the group consisting of Cu, Ag, Au and mixtures thereof, A represents a halogen atom, a carboxylate group or a triflate group, L represents a ligand of the metal M, and n is 1 to 5, characterized in that it is carried out in a water-miscible organic solvent and comprises the following stages: a) mixing, with stirring, in said solvent, a metal salt MA and/or a metal M, the ligand L, the halocarbon compound of formula (III) and the nitroxide (II) at a compound (III)/nitroxide (II) molar ratio ranging from 1 to 1.5, b) maintaining, with stirring, the reaction medium at a temperature ranging from −10° C. to 60° C. until the nitroxide (II) has completely disappeared, c) adding an aqueous solution of a strong acid with a concentration ranging from 5 to 40%, d) recovering an alkoxyamine (I) from stage c) by filtration.