Process for the preparation of six-membered ring carbocycles

US6255530A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rolf Albach · Recklinghausen, DE
• Manfred Jautelat · Burscheid, DE

Key dates

• Filing date: Feb 22, 1999
• Grant date: Jul 3, 2001
• Expiry date: Feb 22, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Six-membered ring carbocycles of the formula (II) can be prepared by ring hydrogenation of aromatic compounds of the formula (I) ##STR1## the definitions for which are given in the description, in a reaction system consisting of two liquid, immiscible phases in which elemental hydrogen is dispersed. The first phase consists of the aromatic compound (I) and, if necessary, a water-immiscible solvent. The second phase is essentially aqueous and comprises, colloidally dispersed therein, a hydrogenation-active metal as hydrogenation catalyst, and auxiliaries for stabilizing the colloidal catalyst. The process is carried out at from 50 to 180.degree. C. and from 1 bar to 400 bar.