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Acid treatment of halloysite nanoclay: Eco-friendly heterogeneous catalyst for the synthesis of pyrrole derivatives
Ali Maleki, Zoleikha Hajizadeh
Catalysts and Organic Synthesis Research Laboratory, Department of Chemistry, Iran University of Science and Technology, Tehran 1684613114, Iran

Published: 14 November 2018 by MDPI AG in Proceedings of The 22nd International Electronic Conference on Synthetic Organic Chemistry in The 22nd International Electronic Conference on Synthetic Organic Chemistry session General Organic Synthesis
MDPI AG, 10.3390/ecsoc-22-05654

Halloysite is a two-layered aluminosilicate with a tube structure. The external surface and the internal of halloysite nanotubes (HNTs) are composed of silicon-oxygen tetrahedron and alumina oxygen octahedrons, respectively. The reaction of the acid with both the outer and inner surfaces of the nanotubes causes the AlO6 octahedral layers to dissolve and dealumination occurred. The acid treatment of halloysite has been used as a traditional chemical activation method for improving the performance of its catalytic activity. In continues to our research and due to the importance of pyrrole scaffold, herein, an efficient synthesis of pyrrole derivatives was carried out in the presence of a catalytic amount of acid treatment HNTs as a nanocatalyst in ethanol at room temperature in high yields. The solid nanocatalyst can be recovered easily and reused without any significant loss of the catalytic activity.

Keywords: structure, Oxygen, Nanocatalyst, Halloysite, acid treatment, Synthesis of Pyrrole Derivatives
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