The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 31, 1995
Filed:
Nov. 04, 1993
Andreas Kanschik-Conradsen, Garbsen, DE;
Theodor Papenfuhs, Frankfurt am Main, DE;
Hoechst Aktiengesellschaft, Frankfurt, DE;
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.