Process for the preparation of 2,3,4,5-tetrafluoro-benzotrifluoride

摘要

Prepn. of polyhalobenzoyl chlorides of formula (III) comprises partial hydrolysis of the corresp. benzotrichloride derivs. of formula (II) in presence of ferric chloride. Also claimed is the prepn. of (II) by reacting benzotrifluoride derivs. of formula (I) with a chloride of Friedel-Crafts catalyst type. Prepn. of (III) from (I) via (II) by a combination of the two processes is also claimed. X = Cl or F; Y = H or F, Cpds. (II) and (III); Y = H) are new. In prepn. of (II), the chloride is AlCl3, TiCl4, SbCl5 or BCl3. Prepn. of (III) is effected in presence of 0.9-1.05 mol. water and 0.1-10 wt.% FeCl3, both based on (II).