Patent ID: 7524976
Filing Date: 2009-04-28
Classification: C07D

Abstract:
1. Process for preparing compounds of the formula (I) in which R 1 is C 1 -C 12 -alkyl, C 1 -C 12 -fluoroalkyl, C 1 -C 12 -alkoxy, C 1 -C 12 -fluoroalkoxy, bromine, chlorine or fluorine and n is 0, 1, 2 or 3, characterized in that compounds of the formula (II) are reacted in the presence of boron trifluoride and hydrogen fluoride initially to give compounds of the formula (III) and the compounds of the formula (III), optionally after at least partial removal of boron trifluoride and/or hydrogen fluoride by distillation, are hydrolysed in aqueous acidic or alkaline medium to give compounds of the formula (I).