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Takale S.,Changu Kana Thakur Research Center | Patil J.,Changu Kana Thakur Research Center | Padalkar V.,Institute of Chemical Technology | Pisal R.,Changu Kana Thakur Research Center | Chaskar A.,National Taiwan University
Journal of the Brazilian Chemical Society | Year: 2012

A multicomponent one-pot reaction of aromatic aldehyde, malononitrile and thiophenol in the presence of iodoxybenzoic acid (IBX) in aqueous media furnished 2-amino-3,5-dicarbonitrile-6-thiopyridine in good to excellent yield. Eventually, a catalyst could be easily recovered and reused without loss of its catalytic property. © 2012 Sociedade Brasileira de Química.

Chaskar A.,Polytechnic of Milan | Padalkar V.,Institute of Chemical Technology | Phatangare K.,Institute of Chemical Technology | Takale S.,Changu Kana Thakur Research Center | Murugan K.,National Taiwan University
Green Chemistry Letters and Reviews | Year: 2013

Silica-supported sodium hydrogen sulfate (NaHSO4·SiO2) efficiently catalyzed the three-component reactions of o-phenylenediamine, 2-mercaptoacetic acid, and aromatic aldehydes, and it formed the corresponding 1-aryl-1H,3H-thiazolo[3,4-a]benzimidazole. The catalyst is inexpensive and eco-friendly and works under heterogeneous conditions. © 2013 Copyright Atul Chaskar, Vikas Padalkar, Kiran Phatangare, Santosh Takale and Kaliyappan Murugan.

Langi B.,Changu Kana Thakur Research Center | Shah C.,Bhabha Atomic Research Center | Singh K.,Bhabha Atomic Research Center | Chaskar A.,Changu Kana Thakur Research Center | And 2 more authors.
Materials Research Bulletin | Year: 2010

A simple wet chemical method has been used to synthesize selenium nanoparticles by the reaction of ionic liquid with sodium selenosulphate, a selenium precursor, in the presence of polyvinyl alcohol stabilizer, in aqueous medium. The method is capable of producing spherical selenium nanoparticles in the size range of 76-150 nm under ambient conditions. This is a first report on the production of nano-selenium assisted by an ionic liquid. The synthesized nanoparticles can be separated easily from the aqueous sol by a high-speed centrifuge machine, and can be re-dispersed in an aqueous medium. The synthesized selenium nanoparticles have been characterized by X-ray diffraction, energy dispersive X-ray analysis, differential scanning calorimetry and transmission electron microscopy techniques. © 2010 Elsevier Ltd. All rights reserved.

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