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Multi-wall carbon nanotube supported Co (II) Schiff base complex: an efficient and highly reusable catalyst for synthesis of 1-amidoalkyl-2-naphthol and tetrahydrobenzo[b]pyran derivatives

Research paper by Jamshid Rakhtshah, Sadegh Salehzadeh

Indexed on: 02 Aug '16Published on: 01 Aug '16Published in: Applied Organometallic Chemistry



Abstract

An immobilized Co (II) Schiff base complex supported on multi-wall carbon nanotubes was synthesized and characterized using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, thermogravimetric analysis and inductively coupled plasma mass spectrometry. It was shown that the supported complex is a facile, eco-friendly, recyclable, reusable and green catalyst for three-component condensation of 2-naphthol and acetamide with various aldehydes for the synthesis of 1-amidoalkyl-2-naphthol derivatives under solvent-free conditions. Also, in a further study, the catalytic application was studied in the synthesis of tetrahydrobenzo[b]pyran derivatives via the condensation reaction of malononitrile and dimedone with several aromatic aldehydes. The procedures suggested here for the synthesis of 1-amidoalkyl-2-naphthol and tetrahydrobenzo[b]pyran derivatives offer several advantages, such as stability, recyclability and eco-friendliness of the catalyst, simple experimental conditions, short reaction times, high to excellent yields and easy work-up.