of arylidene ethylcyanoacetate derivatives in the presence of catalytic amounts of molybdenum oxide nanoparticles (MoO₃ NPs) under green conditions at ambient temperature. From the reaction, a wide range of novel arylidene ethylcyanoacetates was successfully synthesized with high yields from the Knoevenagel condensation reaction between various aryl aldehydes and ethylcyanoacetate in the presence