4-acylaminopiperidin-N-oxyle

US5922244A · kind A · utility

Assignee

• BASF SE

Inventors

• Andreas Koch · Frankenthal (Pfalz), DE
• Alexander Aumuller · Neustadt, DE
• Konrad Mitulla · Ludwigshafen, DE
• Gregor Tremmel · Havelsee, DE
• Holger Herbst · Bischofswerda, DE

Key dates

• Filing date: Sep 22, 1997
• Grant date: Jul 13, 1999
• Expiry date: Sep 22, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/59
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

4-Acylaminopiperidine N-oxides Ia EQU A.sup.1 B.sup.1 (Ia) where A.sup.1 is hydrogen or an organic radical and B.sup.1 is a radical IIa ##STR1## where R.sup.1 -R.sup.4 are each C.sub.1 -C.sub.4 -alkyl and R.sup.1 and R.sup.2, on the one hand, and R.sup.3 and R.sup.4, on the other hand, may furthermore be bonded to form a 5-membered or 6-membered ring, R.sup.5 is H or C.sub.1 14 C.sub.4 -alkyl and R.sup.6 is H or C.sub.1 -C.sub.18 -alkyl, are used for stabilizing organic materials against the harmful effect of free radicals, particularly in the distillation of monomers which undergo free radical polymerization, especially styrene.