Process for the preparation of a bis-salicylidene-alkylene-diaminocobaltous ion complex

US4562277A · kind A · utility

Assignee

• BASF SE

Inventors

• Harald Laas · Frankenthal (Pfalz), DE
• Peter Tavs · Schifferstadt, DE
• Heinz Hannebaum · Ludwigshafen, DE
• Manfred Stroezel · Ilvesheim, DE

Key dates

• Filing date: Jan 18, 1984
• Grant date: Dec 31, 1985
• Expiry date: Jan 18, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C46/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Improved process for the preparation of salcomine useful as an oxidation catalyst for the oxidation of alkylated phenols to the corresponding alkylated p-benzoquinones by reacting salicylaldehyde with ethylenediamine in a mole ratio of about 2:1 and a cobalt salt in a liquid reaction medium wherein the reaction medium is a linear or cyclic carboxamide which is disubstituted on the nitrogen, in particular dimethylformamide, and the cobalt salt is cobalt carbonate or with the cobalt hyroxide carbonate, 2 CoCO.sub.3.3 Co(OH).sub.2.H.sub.2 O. Preparation of the salcomine in accordance with the invention offers significant advantages, both in the preparation of the salcomine itself and in the subsequent oxidation of the trimethylphenol to trimethyl-p-benzoquinone utilizing the salcomine.