PREPARING STERIC HINDERED AMINE ETHERS Russian patent published in 2004 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to new steric hindered amine ethers designated for stabilization of organic materials. Invention describes method for preparing compound of the formula (I) wherein R₁, R₂, R₃, R₄ mean independently of one another C₁-C₈-alkyl or C₁-C₅-hydroxyalkyl; or R₁ and R₂ in common with carbon atom to which they are bound represent C₅-C₁₂-cycloalkyl; or R₃ and R₄ in common with carbon atom to which they are bound represent C₅-C₁₂-cycloalkyl; R₅, R₆, R₇, R₈, R₉ mean independently of one another hydrogen atom, C₁-C₈-alkyl, C₂-C₈-alkenyl, C₅-C₁₂-aryl, C₁-C₄-haloalkyl, electron-removing group or C₆-C₁₂-aryl that is substituted with residue taken among C₁-C₄-alkyl, C₁-C₄-alkoxy-group, halogen atom; R₇ and R₈ can form in common chemical linkage also; R is an organic binding group comprising 2-500 carbon atoms and forming substituted 5-, 6- or 7-membered structure of cyclic ring in common with carbon atoms with which it is bound directly and with nitrogen atom. Method for preparing involves oxidation of compound of the formula (II) wherein R₁-R₉ have values indicated above. Compound of the formula (I) can be hydrogenated or halogenated by conventional methods. Compounds of the formula (I) and corresponding hydrogenated and/or halogenated compounds are used as stabilizing agents for organic materials against disruption by light, oxygen and/or temperature and against yellowing also being some of them are active as a fireproofing compound. EFFECT: improved preparing method. 15 cl, 5 tbl, 26 ex