| abstract |
A process for producing a compound of general formula (I) in which R<1> and R<2> are hydrogen or C1-C4 alkyl and R<3> is a C1-C10 alkyl radical, a phenyl radical or a C1-C4 alkyl-substituted phenyl radical, in which a compound (II) is reacted with a compound of the formula (III), in which X is chlorine, bromine or iodine, in the presence of a Friedel-Crafts catalyst in one step to form a compound (I). |