A rapid, efficient, and novel methodology for the synthesis of 2-aryl-1 H-phenanthro [9, 10-d] imidazole derivatives, catalyzed by bis [N-(3, 5-dicumylsalicylidene)-2′, 6′-fluoroanilinato] zirconium (IV) dichloride under ultrasonic irradiation at room temperature, is reported. A range of substituted imidazoles was synthesized in excellent yields from one-pot reaction of aromatic aldehydes, 9, 10-phenanthrenequinone, and ammonium acetate. The ...