Process for the preparation of sterically hindered nitroxyl ethers

Abstract

Provided is a process for alkylating a sterically hindered nitroxyl compound to the corresponding sterically hindered alkoxyamine, which process comprises reacting said sterically hindered nitroxyl compound with a peroxide selected from diacyl peroxides of the formula (A), peresters of the formula (A) and oxalic acid peresters of the formula (D) R—CO—O—O—Z—R  (A), R—Z″—X—CO—CO—O—O—Z″—R  (D), wherein each R independently stands for a primary or secondary alkyl or cycloalkyl radical, and X is oxygen —O— or a peroxy group —O—O—, Z stands for CO or an alkylene bonded over a quaternary carbon atom, which is an alkylene of the formula (C) R′—C—R′  (C) wherein each R′ is selected from alkyl of 1 to 15 carbon atoms, Z″ stands for said alkylene bonded over a quaternary carbon atom of the formula (C), provided that, in case that Z is CO, the sterically hindered nitroxyl compound is not 4-hydroxy-1-oxyl-2,2,6,6-tetramethyl-piperidine, and other processes and products.

Dependencies are inferred from the claim text.