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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.65  Durban  2012

 

RESEARCH ARTICLE

 

Dodecatungstocobaltate and Sn (IV)-substituted polyoxometalate: Preparation, characterization and catalytic performances in solventless synthesis of bis(indolyl)methanes

 

 

Ezzat Rafiee*; Zohreh Zolfagharifar; Mohammad Joshaghani; Sara Eavani

Faculty of Chemistry, Razi University, Kermanshah, 67149, Iran

 

 


ABSTRACT

Electrophilic substitution reaction of indole with various aldehydes and cyclohexanone were carried out in the presence of electron-transfer (K5CoW12O40.3H2O) and green Lewis acid ([(n-C4H9)4N]3PMo2W9(Sn4+.H2O)O39) catalysts. These catalysts were characterized by N2-adsorption measurements, FT-IR, UV-Vis, 31P NMR, TGA, cyclic voltammetry and elemental analysis. Mechanisms for their catalytic activity are proposed. Both of these catalysts can be recovered and reused.

Keywords: Dodecatungstocobaltate, Sn (IV)-substituted polyoxometalate, bis(indolyl)methanes, electrophilic substitution, solvent-free conditions


 

 

Full text available only in PDF format.

 

Acknowledgements

The authors thank the Razi University Research Council and Kermanshah Oil Refining Company for support of this work.

 

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Received 22 December 2011
Revised 14 June 2012
Accepted 19 June 2012

 

 

* To whom correspondence should be addressed. E-mail: ezzat_rafiee@yahoo.com / e.rafiei@razi.ac.ir

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