@article { ISI:000269664200021, title = {Catalytic synthesis of chalcone and flavanone using Zn-Al hydrotalcite adhere ionic liquid}, journal = {Catalysis Communications}, volume = {10}, number = {14}, year = {2009}, month = {AUG}, pages = {1881-1888}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The Claisen-Schmidt condensation of 2{\textquoteright}-hydroxy acetophenone and benzaldehyde to chalcone and flavanone show that calcined Zn-Al (6) hydrotalcite is active for this synthesis. Coating of ionic liquid {\textquoteleft}1-(tri-ethoxy-silyl-propyl)-3-methyl-imidazolium chloride{\textquoteright} on Zn-Al hydrotalcites was accomplished employing incipient wetness process and on NaY, NaX, MK-5 and silica gel employing co-condensation methodology. Impregnated IL on calcined Zn-Al (6) catalysts were characterized by XRD, SEM, BET, (13)C and (27)Al NMR analysis and the activity of these catalysts were investigated for chalcone and flavanone synthesis. (27)Al CP MAS NMR technique was used to show that interaction of IL with hydrotalcite modifies the acid-base sites and is responsible for enhancement of catalyst activity. Several aromatic aldehydes were screened to assess the general applicability of the system. (c) 2009 Published by Elsevier B.V.

}, keywords = {(27)Al CP MAS NMR, chalcone, Claisen-Schmidt condensation, Flavanone, Ionic liquid, Zn-Al hydrotalcite}, issn = {1566-7367}, doi = {10.1016/j.catcom.2009.06.018}, author = {Kunde, Lalita B. and Gade, Swapna M. and Kalyani, Vishwanath S. and Gupte, Sunil P.} } @article { ISI:000309382100040, title = {Synthesis of glycidol from glycerol and dimethyl carbonate using ionic liquid as a catalyst}, journal = {Catalysis Communications}, volume = {27}, year = {2012}, month = {OCT}, pages = {184-188}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Transesterification of dimethyl carbonate with glycerol has been investigated using various ionic liquids as catalysts. Synthesis of glycidol with high selectivity (78\%) has been achieved using tetramethylammonium hydroxide ([TMA][OH]) as a catalyst at 80 degrees C. Effect of various reaction conditions on the activity and selectivity was investigated and catalyst concentration had a significant influence on conversion as well as selectivity to glycidol. Activity as well as selectivity of the catalyst decreased significantly with increase in moisture content. Recycle experiment indicated slight drop in glycerol conversion and selectivity to glycidol because of dilution of reaction mixture and also the presence of products from the initial experiment. (C) 2012 Elsevier B.V. All rights reserved.

}, keywords = {Glycerol carbonate, Glycidol, Ionic liquid, Transesterification of glycerol}, issn = {1566-7367}, doi = {10.1016/j.catcom.2012.07.003}, author = {Gade, Swapna M. and Munshi, Mudassir K. and Chherawalla, Batul M. and Rane, Vilas H. and Kelkar, Ashutosh A.} } @article { ISI:000338486300020, title = {1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU): a highly efficient catalyst in glycerol carbonate synthesis}, journal = {Journal of Molecular Catalysis A-Chemical}, volume = {391}, year = {2014}, month = {SEP}, pages = {144-149}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Transesterification of dimethyl carbonate (DMC) with glycerol (GLY) was investigated using various amines as catalysts. Amidines like 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) were found to be the best catalysts for this reaction. Best results: 98\% conversion of GLY with 96\% selectivity to GC (TON: 9408), were obtained with DBU as a catalyst. Effect of various reaction conditions on activity and selectivity were investigated using DBU as catalyst. The mechanism of the reaction was investigated with the help of H-1, C-13 and N-15 NMR analysis and OFT calculations. (C) 2014 Elsevier B.V. All rights reserved.

}, keywords = {DBU, Glycerol, Glycerol carbonate, transesterification}, issn = {1381-1169}, doi = {10.1016/j.molcata.2014.04.016}, author = {Munshi, Mudassir K. and Gade, Swapna M. and Mane, Manoj V. and Mishra, Deepti and Pal, Sourav and Vanka, Kumar and Rane, Vilas H. and Kelkar, Ashutosh A.} } @article { ISI:000335226700033, title = {Efficient synthesis of glycerol carbonate/glycidol using 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU) based ionic liquids as catalyst}, journal = {RSC Advances}, volume = {4}, number = {33}, year = {2014}, month = {FEB}, pages = {17124-17128}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Transesterification of dimethyl carbonate with glycerol to glycerol carbonate has been catalyzed efficiently using basic ionic liquids as catalysts. Activity of all the ILs tested is very high and the best result (96\% conversion with 82\% selectivity to glycerol carbonate and 18\% selectivity to glycidol) was obtained using IL1 as catalyst. The effect of catalyst loading has significant influence on the selectivity pattern. The higher activity of the ionic liquid is explained with a plausible mechanism based on the co-operative effect of both cation and anion.

}, issn = {2046-2069}, doi = {10.1039/c3ra47433j}, author = {Munshi, Mudassir K. and Biradar, Pradeep S. and Gade, Swapna M. and Rane, Vilas H. and Kelkar, Ashutosh A.} } @article { ISI:000340427600012, title = {Role of cation-anion cooperation in the selective synthesis of glycidol from glycerol using DABCO-DMC ionic liquid as catalyst}, journal = {RSC Advances}, volume = {4}, number = {61}, year = {2014}, month = {JUL}, pages = {32127-32133}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Transesterification of dimethyl carbonate with glycerol has been investigated using 1,4-diazabicyclo [2.2.2] octane (DABCO) based ionic liquid as a catalyst. DABCO reacted with dimethyl carbonate to form ionic liquid as the reaction progressed. Though the basicity of DABCO based ionic liquid was lower than that of DABCO, the catalytic activity and selectivity to glycidol was higher with DABCO based ionic liquid as a catalyst, indicating that basicity may not be the only criterion in deciding activity and selectivity of the reaction. The cooperative effect of the cation and anion of the ionic liquid is responsible for the observed results. The best results (97\% glycerol conversion with 83\% selectivity to glycidol and 17\% selectivity to glycerol carbonate) were obtained using DABCO based ionic liquid as a catalyst. A plausible mechanism involving the role of both the cation and anion of the ionic liquid has been proposed.

}, issn = {2046-2069}, doi = {10.1039/c4ra04290e}, author = {Munshi, Mudassir K. and Gade, Swapna M. and Rane, Vilas H. and Kelkar, Ashutosh A.} } @article { ISI:000362588700016, title = {Alumina-supported copper iodide: an efficient and recyclable catalyst for microwave-assisted synthesis of 1,4-disubstituted 1,2,3-triazoles via three-component reaction in water}, journal = {Asian Journal of Organic Chemistry}, volume = {4}, number = {9}, year = {2015}, month = {SEP}, pages = {943-951}, publisher = {WILEY-V C H VERLAG GMBH}, address = {POSTFACH 101161, 69451 WEINHEIM, GERMANY}, abstract = {

A one-pot procedure for the synthesis of 1,4-disubstituted 1,2,3-triazoles by a three-component reaction of allyl or benzyl halides, sodium azide, and terminal alkynes over a neutral alumina-supported copper iodide catalyst has been developed. The products were isolated by simple filtration followed by washing of the catalyst with acetone. The products were obtained in almost pure form in up to 98\% yield (TON 495). The catalyst can be recycled for more than eight subsequent reactions. The halides are directly converted into triazoles via in situ formation of azides and thus handling of hazardous azides can be avoided. The broad scope of this protocol is shown by the synthesis of a variety of diversely substituted 1,2,3-triazoles and also two-component azide-alkyne click reaction. The key features of this procedure are the use of water as a solvent, recyclability of the catalyst up to eight runs without appreciable loss of activity, and high yields of products. The catalyst has been fully characterized by FTIR, solid-state NMR and EDX spectroscopy, ESEM, TGA, and XRD.

}, keywords = {1, 2, 3-triazoles, 4, copper(I) iodide, Cycloaddition, disubstituted 1, Microwave chemistry, supported catalysts}, issn = {2193-5807}, doi = {10.1002/ajoc.201500189}, author = {Agalave, Sandip G. and Pharande, Shrikant G. and Gade, Swapna M. and Pore, Vandana S.} } @article {48072, title = {Perception of glycerol carbonate as green chemical: synthesis and applications}, journal = {Catalysis Communications}, volume = {172}, year = {2022}, month = {DEC}, pages = {106542}, type = {Article}, abstract = {

Glycerol carbonate (GC) is a prominent component in industrial practice and has a remarkable potential for the sophisticated applications. While GC has come into prominence due to the perceived overflow of glycerol (GLY) as a coproduct of biodiesel industry, its contemporary and future downstream applications are driving tremendous interest in recent years. This review comprises strategies for glycerol carbonate synthesis, properties and its applications. The conversion of GLY to GC via transesterification has appeared in consensus to be the most promising route. A detailed explanation of the effect of the catalysts and operating conditions on the GC yield to provide an updated understanding of the process are summarized. Future directions for GC production through catalytic transesterification are also discussed.

}, keywords = {Biodiesel, biofuels, catalysis, Glycerol, Glycerol carbonate, green chemistry, transesterification}, issn = {1566-7367}, doi = {10.1016/j.catcom.2022.106542}, author = {Gade, Swapna M. and Saptal, Vitthal B. and Bhanage, Bhalchandra M.} }