South African Journal of Chemistry
On-line version ISSN 1996-840X
Print version ISSN 0379-4350
YELWANDE, Ajeet A.; ARBAD, Balasaheb R. and LANDE, Machhindra K.. Polyaniline/SiO2 catalyzed one-pot synthesis of tetrahydrobenzo[b]pyran derivatives. S.Afr.j.chem. (Online) [online]. 2010, vol.63, pp.199-203. ISSN 1996-840X.
Polyaniline/SiO2 is an efficient catalyst for the synthesis of tetrahydrobenzo[b]pyran derivatives from a one-pot, three component, condensation of aldehydes, malononitrile and dimedone at room temperature. This protocol has several advantages such as high yield, a simple work up procedure, low toxicity and easy recovery and reusability of the catalytic material. The catalyst has been readily prepared and characterized by means of thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR).
Keywords : Chemical oxidative method; Polyaniline/SiO2; tetrahydrobenzo[b]pyran.