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

US5149886A · 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: Sep 22, 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 a process for the preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene by condensing 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 catalyst, the improvement comprising distilling water of reaction and dissolved hydrochloric acid from the completed reaction mixture, dissolving the distillation residue in a nitrile, separating the crystallized adduct of nitrile and 9,9-bis-(4-hydroxphenyl)- fluorene from the nitrile and optionally dissociating the adduct to recover high purity 9,9-bis-(4-hydroxphenyl)- fluorene.