Method for making 9,9-bis-(4-hydroxyphenyl)-fluorene

US4675458A · kind A · utility

Assignee

• Ronm GmbH · DE

Inventors

• Achim Riemann · Marburg, DE
• Werner Ude · Darmstadt, DE

Key dates

• Filing date: Oct 3, 1985
• Grant date: Jun 23, 1987
• Expiry date: Oct 3, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2603/18
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method for making 9,9-bis-(4-hydroxyphenyl)-fluorene by reacting fluorenone with phenol at a temperature from 20.degree. to 100.degree. C. in the presence of sulfuric acid of a concentration higher than 70 percent and of a mercaptan, and particularly beta-mercaptopropionic acid, as acidic condensing agents.