Method for producing a dinitronaphthalene-isomer mixture having a high 1,5-dinitronaphthalene proportion

US6242656A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christian Steinlein · Ratingen, DE
• Gerhard Wegener · Mettmann, DE

Key dates

• Filing date: Mar 1, 2000
• Grant date: Jun 5, 2001
• Expiry date: Mar 1, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C201/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for producing a mixture of isomers of dinitronaphthalene by nitration of nitronaphthalene, in which nitronaphthalene, optionally in an inert organic solvent, is reacted with 1 to 20 times the equivalent quantity, based on the quantity of nitronaphthalene, of 50% to 100% nitric acid in the presence of a solid, perfluorinated, strongly acidic ion exchanger.