Synthesis and Characterization of 1‐(Carboxymethyl)Pyridinium Bromide [CMPy]Br Molten Salt: Application as a Novel Nanocatalyst for the Synthesis of Bis‐Naphthodipyrans
ChemistrySelect Vol. 3, No. 45, 12791–12796
چکیده
Abstract Herein, a convenient method for the synthesis of bis‐naphthodipyrans from the condensation of naphthalene‐2,3‐diol, malononitrile and various aromatic aldehydes using acetic acid functionalized pyridinium salt 1‐(carboxymethyl)pyridinium bromide [CMPy]Br as a novel, efficient, reusable and nanocatalyst is described. The synthesized catalyst was fully characterized by using various techniques such as single crystal X‐ray diffraction (SCXRD), 1 H NMR, 13 C NMR, Fourier transform infrared spectroscopy (FT‐IR), mass spectra, scanning electron microscope (SEM), transmission electron microscopy (TEM), X‐ray diffraction analysis (XRD) and Differential thermal analysis (TG/DTG). The major advantages of the convenient method are high yields, short reaction time, and reusability of the catalyst.