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,
kEYiA&sig2=ZreZksv_Yb7i3fliKYAfjg&bvm=bv.92291466,d.bGQ" title="Link to external resource: http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&cad=rja&uact=8&ved=0CDoQFjAI&url=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FEnergy-dispersive_X-ray_spectroscopy&ei=8whJVfW_KMv4UJvQgOAH&usg=AFQjCNGukh_d_Co5x-jjjV9UjtGctkEYiA&sig2=ZreZksv_Yb7i3fliKYAfjg&bvm=bv.92291466,d.bGQ" target="_blank">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 proce
dures 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.