Preparation of aliphatically substituted fluorobenzenes

Details Preparation of aliphatically substituted fluorobenzenes Preparation of aliphatically substituted fluorobenzenes

C - Chemistry, Metallurgy

07

C

260/652

C07C 25/00 (2006.01) C07C 17/093 (2006.01)

Patent

CA 2011002

- 11 - O.Z. 0050/406/0 Abstract of the Disclosure: Aliphatically substituted fluorobenzenes of the general formula I Image I 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 correspond- ing aniline derivative of the general formula II Image II in the presence of tetrafluoboric acid and decomposition of the resulting diazonium tetrafluoborate of the general formula III Image III by a process in which the decomposition reaction is carried out simultaneously with the diazotization reac- tion, in the presence of elemental copper and/or copper- (I) and/or copper(II) salts and at from -15 to 80°C.

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