Derivatives of 1-oxyl-4-hydroxy- or...

Details Derivatives of 1-oxyl-4-hydroxy- or... Derivatives of 1-oxyl-4-hydroxy- or...

C - Chemistry, Metallurgy

07

D

C07D 211/94 (2006.01) C07B 63/04 (2006.01) C07C 51/50 (2006.01) C07C 57/04 (2006.01) C07C 57/075 (2006.01)

Patent

CA 2337032

Selected derivatives of 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine and 1- oxyl-2,2,6,6-tetramethyl-4-aminopiperidine are surprisingly effective as inhibitors to prevent the premature polymerization of acrylic and methacrylic acids, their esters, their amides, vinyl acetate and acrylonitrile in the presence of water. Some of these derivatives are new compounds.

L'invention concerne des dérivés sélectionnés de 1-oxyl-2,2,6,6-tétraméthyl-4-hydroxypipéridine et de 1-oxyl-2,2,6,6-tétraméthyl-4-aminopipéridine, lesquels, de façon surprenante, se sont avérés efficaces comme inhibiteurs de la polymérisation prématurée des acides acrylique et méthacrylique, de leurs esters, de leurs amides, de l'acétate de vinyle et de l'acrylonitrile en présence d'eau. Certains de ces dérivés sont de nouveaux composés.

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