FIELD: organic chemistry. SUBSTANCE: indanones and their isomers have formula 
where R1-R7 are preferably hydrogen or alkyl or where adjacent residues R1-R4 form cycle. Said compounds are prepared by single step interaction compound having formula (I) 
with anhydride of carboxylic acid having formula (II) 
or with acid fluoride having formula (III) 
. The process is carried out in liquid hydrogen fluoride. EFFECT: improved efficiency of the method. 4 cl
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