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Kumbhar A.,Padmabhushan Dr Vasantraodada Patil College | Salunkhe R.,Shivaji University
Current Organic Chemistry | Year: 2015

This review mainly discusses the various supporting tactics that have been used for the immobilization of Pd complexes, and Pd nanoparticles typically on biopolymers, and the different characterization techniques used for the resulting catalytic materials. The discussion also focuses on the detailed catalytic applications of these catalysts in various organic transformations such as oxidation, hydrogenation and C-C cross coupling reactions including Mizoroki-Heck, Suzuki-Miyaura, Sonogashira, Stille and Tsuji-Trost reactions. © 2015 Bentham Science Publishers.

Patil S.B.,Krantisinh Nana Patil College | Patil R.P.,M.H. Shinde Mahavidyalaya | Ghodake J.S.,Padmabhushan Dr Vasantraodada Patil College | Chougule B.K.,Shivaji University
Journal of Magnetism and Magnetic Materials | Year: 2014

The ferrites having general formula Ni0.5-xMg x-0.01Zn0.5-yCoy+0.01Fe2O 4 (x=0.1, 0.2, 0.3, 0.4 and y=0.1, 0.2, 0.3, 0.4) were prepared by ceramic method. The X-ray diffraction studies of compositions reveal formation of single-phase cubic spinal structure. Dielectric properties such as dielectric constant ε′, dielectric loss tangent (tan δ), and ac resistivity were measured at room temperature as a function of frequency in the range from 1 kHz to 1 MHz. The plots of dielectric constant ε′ vs frequency show a normal dielectric behavior of spinel ferrites. The variation of loss tangent (tan δ) as a function of frequency shows a decreasing trend for all the samples except for the composition with x=0.3 and y=0.1, and y=0.2. The variation of ac resistivity with frequency of all the samples shows a decreasing trend with increase in frequency, a normal behavior of ferrites. All the variations are explained on the basis of Fe2+/Fe3+ ion concentration on octahedral sites as well as the electronic hopping between Fe2+↔Fe3+ ions. © 2013 Elsevier B.V.

Kumbhar A.,Padmabhushan Dr Vasantraodada Patil College | Jadhav S.,Shivaji University | Shejwal R.,Lbs College | Rashinkar G.,Shivaji University | Salunkhe R.,Shivaji University
RSC Advances | Year: 2016

Novel multi-cationic ionic liquids containing a mesitylene backbone with acetate and methane sulphonate anions have been synthesized. These ionic liquids were used for the synthesis of 2-amino-4H-chromenes under microwave heating. The effects of nature and amount of ionic liquids on the yield and reaction time were thoroughly investigated. The ionic liquids showed a considerable level of reusability without a significant decrease in catalytic activity. We have successfully combined the advantages of microwave technology with ionic liquids to facilitate the rapid construction of chromene skeletons from readily obtainable and inexpensive materials via a multicomponent strategy. © The Royal Society of Chemistry 2016.

Jadhav S.,Shivaji University | Jagdale A.,Padmabhushan Dr Vasantraodada Patil College | Kamble S.,Yashvantrao Chavan Institute of Science | Kumbhar A.,Padmabhushan Dr Vasantraodada Patil College | Salunkhe R.,Shivaji University
RSC Advances | Year: 2016

Well-dispersed non-spherical PdNPs with a diameter of 39-45 nm supported on a TiO2-cellulose composite (PdNPs@TiO2-Cell) can be synthesized by a simple and clean route. The catalyst was well characterized by XRD, FE-SEM, EDS, and TEM techniques. The PdNPs have good dispersity on the TiO2-Cell support. This results in excellent catalytic activities for the synthesis of biphenyls, acrylates, acetylenes and prochiral ketones using low Pd loading (1 mol%) at comparatively low temperature. The effects of the nature and amount of bases, nature of solvents, amount of catalyst and the reaction temperature on the activity of PdNPs@TiO2-Cell were thoroughly investigated. The catalyst showed at least four times reusability without decrease in catalytic activity. © 2016 The Royal Society of Chemistry.

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