SYNTHESIS OF COUMARIN DERIVATIVES BASED ON MELDRUM ACID AND ITS ANALOGUES.

The article studied the interaction of malonic acid and acetic anhydride with ketones, aldehydes of the fatty, aromatic and carbocyclic series (yields from 16 to 76%). Based on experimental and physical data, it is proved that Meldrum acid exists in solutions in the form of an equilibrium mixture of rapidly convertible conformers.

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