Facile synthesis of highly substituted 2-pyrone derivatives via a tandem Knoevenagel condensation/lactonization reaction of β-formyl-esters and 1,3-cyclohexadiones
Keywords: تراکم نووناگل; 2-Pyrone derivatives; β-Formyl-esters; Knoevenagel condensation; Lactonization; ZnO nanoparticles;