Fluorinated benzils and a process for their preparation

Details Fluorinated benzils and a process for their preparation Fluorinated benzils and a process for their preparation

1993-11-04

1995-10-31

Reamer, James H.

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

Organic compounds

Oxygen containing

568316, 568332, 568306, 558415, C07C 49784

Patent

active

054631351

ABSTRACT:
Fluorinated benzils and a process for their preparation A process for the preparation of fluorinated benzils of the formula (1) ##STR1## in which X.sub.1 -X.sub.6, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hydrogen, fluorine, chlorine or bromine atoms, or alkyl(C.sub.1 -C.sub.10), phenyl or naphthyl groups which may be substituted, or are groups reducing the electron density, at least one of the substituents X.sub.1 -X.sub.6 being a fluorine atom, by reacting 1 mol of a benzil of the formula (1), in which X.sub.1 -X.sub.6 and R.sub.1 and R.sub.2 have the abovementioned meanings, with the proviso that at least one of the substituents X.sub.1 -X.sub.6 is a chlorine atom, with about 0.8 to about 2.5 mol of potassium fluoride, rubidium fluoride, cesium fluoride or tetraalkyl (C.sub.1 -C.sub.18)-ammonium fluoride per chlorine atom to be exchanged, at temperatures of from about 100.degree. C. to about 280.degree. C., possibly in the presence of a phase transfer catalyst and a dipolar aprotic or nonpolar solvent, and the new benzils prepared by this process.

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