Preparation of aliphatically substituted fluorobenzenes

US4996377A · kind A · utility

Assignee

• BASF SE

Inventors

• Jochen Wild · Ruppertsberg, DE
• Albrecht Harreus · Ludwigshafen, DE
• Norbert Goetz

Key dates

• Filing date: Feb 21, 1990
• Grant date: Feb 26, 1991
• Expiry date: Feb 21, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Aliphatically substituted fluorobenzenes of the general formula I ##STR1## where R is an aliphatic or cycloaliphatic radical, n is 2, 3 or 4 and X is hydrogen, fluorine, chlorine or bromine, are prepared by diazotization of the corresponding aniline derivative of the general formula II ##STR2## in the presence of tetrafluoboric acid and decomposition of the resulting diazonium tetrafluoborate of the general formula III ##STR3## by a process in which the decomposition reaction is carried out simultaneously with the diazotization reaction, in the presence of elemental copper and/or copper(I) and/or copper(II) salts and at from -15.degree. to 80.degree. C.