FIELD: chemical industry. SUBSTANCE: present invention describes method for preparing substituted indanones of formula IV or IVa: 
wherein R1-R7 is preferably hydrogen or alkyl, or adjacent residues, R1-R4 form cycle, obtained by one stage reaction which comprises reacting compound of formula (I): 
with compound of formula (II): 
or with compound of formula (III): 
in anhydrous hydrogen fluoride and in the presence on boron trifluoride. EFFECT: more efficient preparation method.
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