Preparation of aliphatically substituted fluorobenzenes

Details Preparation of aliphatically substituted fluorobenzenes Preparation of aliphatically substituted fluorobenzenes

1990-02-21

1991-02-26

Evans, J. E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

568731, 568743, 568775, 570127, 570129, C07C 1722, C07C 2513, C07C 2518

Patent

active

049963775

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.

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