Process for the preparation of N-oxyl hindered amine esters

Details Process for the preparation of N-oxyl hindered amine esters Process for the preparation of N-oxyl hindered amine esters

1994-08-31

1996-11-12

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D21146

Patent

active

055741630

ABSTRACT:
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.degree.-130.degree. 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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Free Radical Res. Comm. 9 (3-6), 379 (1990).
C.A. 109:92734n (1988).
Chem. Papers 42(2) 243-248 (1988).
C.A. 96:84950c (1982).

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