Ultrasonic Promoted Regioselective Reactions of the Novel Spiro 3,1-Benzoxazon-Isobenzofuranone Dye Toward Some Organic Base Reagents. - Hassaballah, Aya I.; Ramadan, Sayed K.; Rizk, Sameh A.; El-Helw, Eman A. E.; Abdelwahab, Salwa S. (Polycyclic Aromatic Compounds, 2023)