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3-Acetyltropolone(1)reacted with 2-hydroxybenzaldehyde(2a),2-hydroxy-5-methylbenzaldehyde(2b),5-chloro-2-hydroxybenzaldehyde(2c)and 2-hydroxy-l-naphthaldehyde in presence of ethylformate and perchloric acid to give the corr-esponding pyranylium tropolone