Process for preparing (4-nitro-sophenyl)phenylhydroxylamine

US6166256A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Henry Giera · Wittlich, DE
• Carl Casser · Neunburg vorm Wald, DE
• Pieter Ooms · Krefeld, DE
• Michael Schelhaas
• Christian Laue · Monheim, DE
• Michaela Meiers · Speyer, DE
• Gerhard Braun · Recklinghausen, DE

Key dates

• Filing date: May 8, 2000
• Grant date: Dec 26, 2000
• Expiry date: May 8, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C239/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention provides a process for preparing (4-nitroso-phenyl)phenyl-hydroxylamine which is characterized in that nitrobenzene is reacted in the presence of hydroxide and/or oxide-containing bases, optionally in the presence of solvents, at temperatures of 20 to 180.degree. C. and pressures of 0.1 to 10 bar. The process according to the invention has the particular advantage that it uses inexpensive and cost-effective nitrobenzene as starting material instead of the nitrosobenzene conventionally used hitherto.