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South African Journal of Chemistry
versión On-line ISSN 1996-840X
versión impresa ISSN 0379-4350
S.Afr.j.chem. (Online) vol.63 Durban 2010
RESEARCH ARTICLE
Polyaniline/SiO2 catalyzed one-pot synthesis of tetrahydrobenzo[b]pyran derivatives
Ajeet A. Yelwande; Balasaheb R. Arbad; Machhindra K. Lande*
Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, (MS) - 431 004, India
ABSTRACT
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
Full text available only in PDF format.
Acknowledgements
The authors are grateful to the Head ot the Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, India, for providing the laboratory facility.
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Received 20 August 2010
Revised 27 October
Accepted 19 November 2010
* To whom correspondence should be addressed. E-mail: mkl_chem@yahoo.com