Continuous process for preparing derivatives of benzene with fluorinated side chains from the corresponding chlorine compounds

US3966832A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Rudolf Lademann
• Helmut Lindner · Eferding, AT
• Thomas Martini · Bad Soden am Taunus, DE
• Peter-Paul Rammelt

Key dates

• Filing date: Nov 7, 1974
• Grant date: Jun 29, 1976
• Expiry date: Nov 7, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/64
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Preparation of derivatives of benzene containing CF.sub.3 groups from the corresponding compounds containing CCl.sub.3 groups (e.g. trichloromethyl benzene) is carried out continuously with excellent yield rates by reaction with liquid hydrogen fluoride in an autoclave above 80.degree.C, (which latter exceeds the stoichiometric proportion by at least 25 mole %). The reactants are fed continuously into the autoclave. The reaction mixture preferably becomes pressurized to at least 20 atmospheres and homogeneous after having reached a certain filling level. The reaction mixture is thereafter withdrawn proportionally to its feeding-in rate. The mixture may be conveyed through one or several additional autoclaves with the final withdrawal of the reaction mixture being out from the terminal autoclave of this cascade. The fluorination products are well known starting and inermediate products for the preparation of dyestuffs and pesticidal compositions.