Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene

US5169990A · kind A · utility

Assignee

• Rutgerswerke Aktiengesellschaft · DE

Inventors

• Winfried Orth
• Emmerich Pastorek · Hemsbach, DE
• Wolfgang Weiss · Ottobrunn, DE
• Hans W. Kleffner · Battenberg, DE

Key dates

• Filing date: Feb 11, 1992
• Grant date: Dec 8, 1992
• Expiry date: Feb 11, 2012

Classification

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

Abstract

In the production of 9,9-bis-(4-hydroxphenyl)-fluorene by condensation by fluorenone and phenol in a molar ratio of 1:4 to 1:8 at 30.degree. to 90.degree. C. in the presence of gaseous hydrogen chloride and .beta.-mercapto-propionic acid as catalyst, the improvement comprising mixing the completed reaction mixture with a polyalkylene glycol, distilling excess phenol from the mixture, and mixing the distillation residue with a solvent miscible with the polyalkylene glycol, recovering the crystallized product, suspending the crystallized product in water and heating the suspension to obtain highly pure 9,9-bis-(4-hydroxyphenyl)-fluorene as white crystals.