An improved process for the preparation of n-oxyl hindered...

Details An improved process for the preparation of n-oxyl hindered... An improved process for the preparation of n-oxyl hindered...

C - Chemistry, Metallurgy

07

D

C07D 211/94 (2006.01) C07B 60/00 (2011.01) C07D 221/20 (2006.01)

Patent

CA 2157147

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°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.

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