Process for the preparation of substituted indanones, and their use

摘要

1-Indanones of the formula IV or IVa <IMAGE> (IV) <IMAGE> (IVa) in which R1 and R7 are preferably hydrogen or alkyl, or adjacent radicals R1 to R4 form a ring, are obtained in a one-step reaction by reacting a compound I <IMAGE> (I) with a compound of the formula II or a compound III <IMAGE> (II) <IMAGE> (III) in liquid hydrogen fluoride.