Process for the preparation of N-(ortho-alkylphenyl)-imides

US5684163A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Torsten Groth · Reinbek, DE
• Bernd-Michael Konig · Düsseldorf, DE
• Josef Kasbauer · Wermelskirchen, DE
• Michael Schwamborn · Cologne, DE

Key dates

• Filing date: Feb 5, 1996
• Grant date: Nov 4, 1997
• Expiry date: Feb 5, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D207/40
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of a N-)ortho-alkylphenyl)-imide of the formula ##STR1## in which R.sup.1 to R.sup.9 is defined in the specification which comprises reacting a cyclic anhydride of the formula ##STR2## wherein R.sup.6 to R.sup.9 are difined in the specification with an amine of the formula ##STR3## optionally in the presence of an acid catalyst and optionally in the presence of a solvent which is immiscible or only slightly miscible with water but can form an azeotrope with water, at a temperature between 100.degree. to 200.degree. C. under conditions so that the water formed during the reaction is removed from the reaction mixture without the addition of a polymerization inhibitor or a dipolar solvent. The final products are used as intermediates to prepare heat-stable plastics as well as intermediates to prepare pharmaceutical and agricultural chemicals.