Process to preparing 2,2,6,6-tetra-methylpiperidine-n-oxyl and its 4-position substituted derivatives

US5416215A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Wilfried Buschken · Haltern am See, DE
• Manfred Kaufhold · Marl, DE
• Peter Bickert · North Edison, US

Key dates

• Filing date: Jun 9, 1993
• Grant date: May 16, 1995
• Expiry date: Jun 9, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D211/94
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process is described for preparing 2,2,6,6-tetramethylpiperidine-N-oxyl and its 4-position substituted derivatives by oxidation of 2,2,6,6-tetramethylpiperidine and its 4-position substituted derivatives in the presence of hydrogen peroxide and low concentrations of divalent metal salts.