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

C - Chemistry, Metallurgy

07

C

C07C 49/76 (2006.01) C07B 39/00 (2006.01) C07C 45/63 (2006.01) C07C 49/813 (2006.01) C07C 65/34 (2006.01) C07C 69/76 (2006.01) C07C 205/45 (2006.01) C07C 235/84 (2006.01) C07C 255/56 (2006.01) C07C 309/86 (2006.01) C07C 317/24 (2006.01)

Patent

CA 2102357

Abstract Fluorinated benzils and a process for their preparation A process for the preparation of fluorinated benzils of the formula (1) Image (1) in which X1-X6, R1, R2, R3 and R4 are hydrogen, fluorine, chlorine or bromine atoms, or alkyl(C1-C10), phenyl or naphthyl groups which may be substituted, or are groups reducing the electron density, at least one of the substituents X1-X6 being a fluorine atom, by reacting 1 mol of a benzil of the formula (1), in which X1-X6 and R1 and R2 have the abovementioned meanings, with the proviso that at least one of the substituents X1-X6 is a chlorine atom, with about 0.8 to about 2.5 mol of potassium fluoride, rubidium fluoride, cesium fluoride or tetraalkyl (C1-C18)-ammonium fluoride per chlorine atom to be exchanged, at temperatures of from about 100°C to about 280°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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