Method of preparing substituted dihydroxy-benzenes

US4825011A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Karl-Heinz Drauz · Alzenau, DE
• Axel Kleeman · Hanau, DE
• Gunter Prescher · Hanau, DE
• Gebhard Ritter · Ingelheim am Rhein, DE

Key dates

• Filing date: Dec 4, 1987
• Grant date: Apr 25, 1989
• Expiry date: Dec 4, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/60
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The nuclear hydroxylation of substituted phenols is performed by using aqueous hydrogen peroxide in the presence of sulfur dioxide or selenium dioxide as catalyst in a simple manner with very good space-time yields and good product yields.