Ultrasonic-assisted preparation of nano eggshell powder: A novel catalyst in green and high efficient synthesis of 2-aminochromenes |
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Authors: | Elaheh Mosaddegh |
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Institution: | Department of New Materials, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, P.O. Box 76315-117, Kerman, Iran |
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Abstract: | The nano eggshell powder (NESP) has been prepared by ultrasound irradiation and used as a novel and biodegradable catalyst with high catalytic activity and reusability in green synthesis of 2-aminochromenes via condensation of α- or β-phathol, malononitrile and aromatic aldehydes at 120 °C under solvent-free conditions. The reaction proceeds to completion within 10–35 min in 91–98% yield. Nano eggshell catalyst was characterized by scanning electron microscopy, X-ray powder diffraction, IR spectroscopy and X-ray fluorescence, thermal gravimetric, surface area and elemental analyses. In addition, the catalytic activity and chemical structure of nano-sized eggshell were compared with pure CaCO3. |
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Keywords: | Nano eggshell powder Sonochemical preparation Natural catalyst XRD 2-Aminochromenes Green chemistry |
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