In the following mixed Claisen ester condensation reaction, the expected products are CH3COOC2H5 + CH3CH2COOC2H5 C2H5ONa C2H5OH⟶
Ti-Crossed-Claisen Condensation between Carboxylic Esters and Acid Chlorides or Acids: A Highly Selective and General Method for the Preparation of Various β-Keto Esters | Journal of the American Chemical Society