Process for the preparation of aqueous diazonium salt solutions

US6207809A · kind A · utility

Assignee

• Clariant Corporation · DE

Inventor

• Bernd Nestler · Jena, DE

Key dates

• Filing date: May 2, 2000
• Grant date: Mar 27, 2001
• Expiry date: May 2, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C245/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An aqueous solution of diazonium salts is prepared in the absence of organic solvents by reducing a water-soluble aromatic nitro compound in aqueous solution with hydrogen and a hydrogenation catalyst to give the aromatic amino compound, and diazotizing this amino compound in the aqueous solution.