Method for producing 2-(4-methyl-3-pentenyl) anthraquinone

US6399795B1 · kind B1 · utility

Assignee

• Degussa AG · DE

Inventors

• Jürgen Glenneberg · Offenbach, DE
• Holger Sauerstein · Großkrotzenburg, DE
• Hubert Angert · Hanau, DE

Key dates

• Filing date: Jul 24, 2001
• Grant date: Jun 4, 2002
• Expiry date: Jul 24, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C46/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method for producing 2-(4-methyl-3-pentenyl)anthraquinone (IHEAQ) that includes a Diels-Alder addition of naphtho-1,4-quinone and myrcene and an oxidation of the resulting adduct. The oxidation step is carried out in the presence of a solvent mixture that contains a polar and a nonpolar solvent. The oxidation takes place with air or an O2-containing gas in the presence of a combination of a strong inorganic base and an organic, especially a nitrogen-containing base. The method leads to a higher space-time yield and higher product purity.