@article { ISI:000256179700013, title = {Catalyst-free efficient synthesis of 2-aminothiazoles in water at ambient temperature}, journal = {Tetrahedron}, volume = {64}, number = {22}, year = {2008}, month = {MAY}, pages = {5019-5022}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A highly efficient and facile method has been described for the synthesis of substituted 2-aminothiazoles in water without any added catalyst or co-organic solvent. The reaction was carried out at ambient temperature and the products were obtained in excellent isolated yields. The developed protocol is successfully applied for the preparation of an anti-inflammatory drug, fanetizole. (C) 2008 Elsevier Ltd. All rights reserved.

}, keywords = {2-aminothiazoles, ambient temperature, environment-friendly synthesis, Water}, issn = {0040-4020}, doi = {10.1016/j.tet.2008.03.082}, author = {Potewar, Taterao M. and Ingale, Sachin A. and Srinivasan, Kumar V.} } @article { ISI:000252252400015, title = {Highly chemoselective catalytic system for hydrogenation of diketones to ketols: an environmentally benevolent system}, journal = {Catalysis Letters}, volume = {120}, number = {3-4}, year = {2008}, month = {JAN}, pages = {257-260}, publisher = {SPRINGER}, type = {Article}, address = {233 SPRING STREET, NEW YORK, NY 10013 USA}, abstract = {

Ru(Phen)(2)Cl-2 [Phen = Phenanthroline] anchored in organo-functionalized MCM-41 [Ru(Phen)(2)Cl-NH-MCM-41] efficiently catalyzes highly chemoselective hydrogenation of diketones to ketols (Sel. similar to 99\%) under environmentally benign tri-phasic (solid-liquid-liquid) reaction condition in aqueous medium.

}, keywords = {Chemoselective, dione, Hydrogenation, ketol, ruthenium phenanthroline, Water}, issn = {1011-372X}, doi = {10.1007/s10562-007-9278-3}, author = {Deshmukh, Amit A. and Kinage, Anil K. and Kumar, Rajiv} } @article { ISI:000285772600015, title = {Heterogenized Ru(II) phenanthroline complex for chemoselective hydrogenation of diketones under biphasic aqueous medium}, journal = {Journal of Molecular Catalysis A-Chemical}, volume = {333}, number = {1-2}, year = {2010}, month = {DEC}, pages = {114-120}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The chemoselective hydrogenation of acetylacetone to 4-hydroxypentan-2-one over immobilized ruthenium phenanthroline metal complexes in amino functionalized MCM-41 in biphasic aqueous reaction medium was investigated. The catalyst was characterized by XRD, TEM, surface analysis, FT-IR and UV-vis to understand the morphology, complex geometry, and XPS such that the oxidation state of the metal complex inside the MCM-41 framework could be understood. The use of water as a solvent, not only gives high activity and selectivity for hydrogenation of acetylacetone, but also gives a path for an environmentally safer process. The optimizations of ligand, metal to ligand ratio, the choice of solvent and other reaction parameters were studied in detail. The heterogeneous catalytic system gave a higher degree of chemoselectivity (99\%) towards 4-hydroxypentan-2-one as compared to homogeneous catalyst when hydrogenation was carried out using water as a solvent. The immobilized ruthenium-phenanthroline complex was easily separated and reused. (C) 2010 Elsevier B.V. All rights reserved.

}, keywords = {4-Hydroxypentan-2-one, acetylacetone, Chemoselective, Diketone, Hydrogenation, Phenanthroline, ruthenium, Water}, issn = {1381-1169}, doi = {10.1016/j.molcata.2010.10.005}, author = {Deshmukh, Amit A. and Kinage, Anil K. and Kumar, Rajiv and Meijboom, Reinout} } @article { ISI:000345054100096, title = {Simple recovery of intracellular gold nanoparticles from peanut seedling roots}, journal = {Journal of Nanoscience and Nanotechnology}, volume = {15}, number = {2}, year = {2015}, month = {FEB}, pages = {1575-1581}, publisher = {AMER SCIENTIFIC PUBLISHERS}, address = {26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USA}, abstract = {

Fabrication of inorganic nanomaterials via a biological route witnesses the formation either extracellularly, intracellulary or both. Whereas extracellular formation of these nanomaterials is cherished owing to their easy and economical extraction and purification processes; the intracellular formation of nanomaterials, due to the lack of a proper recovery protocol has always been dreaded, as the extraction processes used so far were tedious, costly, time consuming and often resulting in very low recovery. The aim of the present study was to overcome the problems related with the extraction and recovery of intracellularly synthesized inorganic nanoparticles, and to devise a method to increasing the output, the shape, size, composition and dispersal of nanoparticles is not altered. Water proved to be much better system as it provided well dispersed, stable gold nanoparticles and higher recovery. This is the first report, where intracellular nanoparticles have been recovered using a very cost-effective and eco-friendly approach.

}, keywords = {gold nanoparticles, Peanut, Recovery, Sonication, Water}, issn = {1533-4880}, doi = {10.1166/jnn.2015.9046}, author = {Raju, D. and Mehta, Urmil J. and Ahmad, Absar} } @article {43987, title = {Manganese incorporated on glucose as an efficient catalyst for the synthesis of adipic acid using molecular O2 in aqueous medium}, journal = {Applied Catalysis A: General}, volume = {546}, year = {2017}, month = {SEP}, pages = {122-125}, type = {Journal Article}, abstract = {A new manganese incorporated on glucose catalyst Mn@CC-SO3H-NH2 was synthesized and well characterized using FT-IR, PXRD, EDAX, SEM, TEM, [13] C cross-polarization NMR and BET analysis. The catalyst thus synthesized was studied for its utility in the synthesis of industrially important chemical adipic acid starting from readily available cyclohexanone using molecular O2 as a source. Adipic acid was obtained in maximum yield of 82\% using Mn@CC-SO3H-NH2 catalyst in water as a solvent. The catalyst was easily recovered and reused for minimum five runs without any significant loss in the yield of products. Using molecular O2 as an oxidant and water as a solvent, the reaction is very important from green chemistry perspectives and can also be industrially feasible. }, keywords = {Adipic Acid, Catalyst, manganese, recyclable, Water}, doi = {10.1016/j.apcata.2017.08.008}, author = {Nale, S.D.}, editor = {Rathod, P. V.} } @article {43888, title = {TiO2/RGO composites: Its achievement and factors involved in hydrogen production}, journal = {Renewable \&sustainable energy reviews}, volume = {76}, year = {2017}, month = {SEP}, pages = {1384-1392}, type = {Article}, abstract = {

The immense potential shown by TiO2 to participate as a designer material resulting into a new class of high performing photocatalyst has acclaimed it to become an important player in the designing and synthesis of various solar harvesting materials. This role has further been explored by the introduction of graphene into TiO2 matrix. TiO2/reduced graphene oxide (TiO2/RGO) or TiO2/graphene (TiO2/GR) has shown its prospects or relevance to be considered as the next generation photocatalyst for hydrogen production by its reported values in terms of producing hydrogen gas. Hence, there is a requirement of having a detailed up to date write up on the work done in this area in terms of its synthetic procedures, properties and its effect on hydrogen production. Herein, we discuss the different methods involved in the synthesis of such highly efficient materials followed by a brief explanation on its structural and morphological properties. Furthermore, a comparative study on the recent developments in terms of hydrogen evolution efficiency along with a mechanistic approach is also described. Finally, the current challenge and possibility of the future development in this direction is emphasized.

}, keywords = {Au-tio2 Photocatalysts, Evolution, Generation, graphene, Hydrogen generation, Nanocomposite, Nitrogen-doped Tio2, Photocatalysis, Photocatalytic H-2 Production, Recent Progress, Reduced graphene oxide, TiO2, Tio2-graphene Nanocomposites, Visible-light Irradiation, Water}, issn = {1364-0321}, doi = {10.1016/j.rser.2017.03.1}, author = {Gupta, Bhavana and Melvin, Ambrose A.} } @article {46913, title = {Enolate-mediated regioselective synthesis of 1,2,3-triazoles via azide-aldehydes or ketones [3+2]-cycloaddition reactions in aqueous phase}, journal = {Tetrahedron Letters}, volume = {61}, year = {2020}, month = {MAR}, pages = {151662}, type = {Article}, abstract = {

A synthetic route for the direct conversion of arylazides into the corresponding trizoles via phase transfer catalyst-assisted [3+2] cycloaddition reaction under basic conditions in aqueous medium is reported. This synthetic methodology, which offers high yields and excellent regioselectivity for varieties of triazoles at 100 degrees C for 24 h-48 h and this {\textquoteleft}greener{\textquoteright} synthesis constitutes an alternative to the previously reported well established click reactions. Published by Elsevier Ltd.

}, keywords = {Azides plus aldehydes or ketones, Click chemistry, triazoles, Water}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2020.151662}, author = {Tripathi, Anupam and Rode, V, Chandrashekhar and Llop, Jordi and Chavan, Subhash P. and Joshi, Sameer M.} } @article {47352, title = {Effect of CaCl2 and ZnCl2 salts on isobaric vapor-liquid equilibrium in separation of the azeotropic mixture of ethanol plus water}, journal = {Fluid Phase Equilibria}, volume = {537}, year = {2021}, month = {JUN }, pages = {113000}, type = {Article}, abstract = {

Present work analyzes potential of calcium chloride (CaCl2) and zinc chloride (ZaCl(2)) salts as entrainer for breaking the minimum boiling azeotrope of ethanol and water. Isobaric vapor-liquid equilibrium (VLE) data for the binary systems of water + ethanol and ternary system of water + ethanol + calcium chloride, and water + ethanol + zinc chloride were measured at a constant pressure of 94.5 kPa. The effect of salts on the relative volatility of ethanol to water as well as on the vapor phase mole fractions of ethanol were also studied experimentally. From the experimental results, it is observed that with addition of salts, the azeotropic point of the ethanol and water system can be eliminated. Salting out effects in case of calcium chloride was more than that zinc chloride salt. The results obtained in this work showed that calcium chloride could be a better choice for separation of the water + ethanol azeotrope. Electrolyte nonrandom two-liquid (eNRTL) model was used to correlate the experimental VLE data. The model prediction with the regressed parameters was found in well agreement with the experimental data. The experimental data obtained in this work was found thermodynamically consistent using van Ness test. (C) 2021 Elsevier B.V. All rights reserved.

}, keywords = {Azeotrope, eNRTL, Ethanol, salts, Vapor-liquid equilibrium, Water}, issn = {0378-3812}, doi = {10.1016/j.fluid.2021.113000}, author = {Ghuge, Pravin D. and Mali, Nilesh A. and Joshi, Sunil S.} } @article {48095, title = {Use of isoperibolic reaction calorimeter for the study of reaction kinetics of acetic anhydride hydrolysis reaction: effect of acetic anhydride and water ratio}, journal = {Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa}, volume = {43}, year = {2022}, month = {DEC}, pages = {255-264}, type = {Article; Proceedings Paper}, abstract = {

Reaction kinetics of acetic anhydride hydrolysis reaction is being studied at a fixed reaction temperature and ambient pressure using an isoperibolic reaction calorimeter. Temperature versus time data along with heat and mass balance is used to determine the kinetics parameters i.e. activation energy and Arrhenius coefficient. It has been studied with the varying volumetric ratio of acetic anhydride and water; and kinetics parameters were compared and plotted for each ratio. Such a study has not been done previously to determine the kinetics dependency on varying the acetic anhydride water ratio. As the acetic anhydride hydrolysis reaction is exothermic in nature, the present study will help to decide the safe and suitable operating conditions such as concentration and temperature for conducting this reaction at plant scale. The kinetic data presented can be used further for the mathematical modeling and simulation of such exothermic hydrolysis reactions.

}, keywords = {acetic anhydride, Hydrolysis, kinetics, reaction calorimeter, Water}, issn = {0208-6425}, doi = {10.24425/cpe.2022.140829}, author = {Kumar, Rajendra and Tiwari, Anurag Kumar} } @article {49547, title = {Synthesis of isatins via oxone{\textregistered} /TBAI-mediated on-water oxidation of indoles}, journal = {Synthesis-Stuttgart}, volume = {57}, year = {2025}, month = {MAY}, pages = {1583-1591}, type = {Article}, abstract = {

Isatins and their derivatives are important scaffolds in a wide range of pharmaceuticals, bioactive compounds, and functional materials. Herein we describe a new strategy for the synthesis of isatins from indoles via Oxone (R)/TBAI-mediated oxidative dearomatization of indoles in water. The strategy works well with a variety of N-protected indoles and azaindoles.

}, keywords = {dearomatization, indoles, isatins, Oxidation, Water}, issn = {0039-7881}, doi = {10.1055/a-2492-3240}, author = {Khajuria, Pratiksha and Bag, Debojyoti and Sawant, Sanghapal D.} }