Acetoacetic-Ester Condensation (Claisen Condensation)
Formation of aceto-acetic-ester by the reaction of sodium ethoxide with ethyl acetate is called Claisen Condensation reaction or The Claisen Condensation reaction between Esters (containing α-hydrogens), in the presence of Bases such as sodium ethoxide, gives β-ketoesters via stabilized anion of the β-keto Ester.