METHOD FOR THE PRODUCTION OF N-OXYL-HIDDEN AMINE ESTERS WITH THE AID OF TETRAALKYLORTHOTITANATE TRANSESTERING CATALYSTS

摘要

When a tetraalkyl orthotitanate transesterification catalyst is used in the preparation of N-oxyl hindered amine esters, the N-oxyl compound is obtained in excellent yield and purity when moderate temperatures (90-130 DEG C) and an aliphatic hydrocarbon solvent are used. The N-oxyl compounds are light stabilizers and also inhibitors for preventing the premature polymerization of ethylenically unsaturated monomers.