The Kostanecki acylation is a process used in organic synthesis to give chromones or coumarins by acylation of o-hydroxyaryl ketones with aliphatic acid anhydrides, followed with cyclization:
![2287_Kostanecki-acylation.png](https://www.expertsmind.com/../CMSImages/2287_Kostanecki-acylation.png)
Reaction Mechanism-
![787_Kostanecki-acylation-mechanism.png](https://www.expertsmind.com/../CMSImages/787_Kostanecki-acylation-mechanism.png)
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