@article { ISI:000237420200060, title = {Hydrophobic effects are dominant over secondary orbital interactions for a simple Diels-Alder reaction in salt solutions}, journal = {Organic Letters}, volume = {8}, number = {10}, year = {2006}, month = {MAY}, pages = {2199-2202}, publisher = {AMER CHEMICAL SOC}, type = {Article}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

The stereoselectivity ratios for a Diels-Alder reaction between cyclopentadiene with methyl trans-crotonate carried out in salt solutions demonstrate the dominance of hydrophobic effects over secondary orbital interactions.

}, issn = {1523-7060}, doi = {10.1021/ol060741q}, author = {Sarma, D. and Kumar, Anil} } @article { ISI:000237820800035, title = {Hydrophobic effects in a simple Diels-Alder reaction in water}, journal = {Tetrahedron Letters}, volume = {47}, number = {23}, year = {2006}, month = {JUN}, pages = {3957-3958}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

The endolexo ratio for a simple Diels-Alder reaction carried out in water has been used to argue that hydrophobic effects can dominate the geometries of the transition states. (c) 2006 Elsevier Ltd. All rights reserved.

}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2006.03.093}, author = {Sarma, D. and Pawar, S. S. and Deshpande, Suvarna S. and Kumar, Anil} } @article { ISI:000249501700020, title = {Homogeneous nucleation temperatures in aqueous mixed salt solutions}, journal = {Journal of Physical Chemistry B}, volume = {111}, number = {37}, year = {2007}, month = {SEP}, pages = {10985-10991}, publisher = {AMER CHEMICAL SOC}, type = {Article}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

This is the first report on the measurement of homogeneous nucleation temperature, T-H, in the presence of aqueous mixed salt systems of varying compositions and ionic strengths. The T-H,T-m (T-H value in aqueous mixed salt system) data for these systems have been analyzed in terms of a simple empirical equation. The T-H.m. values in simple aqueous mixed salts like NaCl-KCl can be approximated by linear summation of the products of ionic strength fraction and the T-H values of pure salt solutions at the same ionic strength as that of the mixture. The empirical parameter, q(0), indicating ionic interaction is related to the viscosity B-coefficients. The T-H.m data, though correlated on the basis of the B-coefficients also depends upon the mixing of two ions of like charges. Further, a linear correlation exists between the q(0) parameter and self-diffusion coefficient, D-0, of the ionic solute. The q(0) parameter is also well correlated with the rotational correlation time, T-c(h)/T-c(0) of the ionic species involved in the mixtures. It is possible to compute T-H,T-m for the salt mixtures with no common ions from the knowledge of the T-H,T-m values of the salt mixtures with common ions.

}, issn = {1520-6106}, doi = {10.1021/jp073846z}, author = {Kumar, Anil} } @article { ISI:000307351500021, title = {High viscosity of ionic liquids causes rate retardation of Diels-Alder reactions}, journal = {Science China-Chemistry}, volume = {55}, number = {8, SI}, year = {2012}, month = {AUG}, pages = {1633-1637}, publisher = {SCIENCE PRESS}, address = {16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA}, abstract = {

Second order rate constants, k (2) have been determined for three bi-molecular Diels-Alder reactions to demonstrate that the high viscosity of ionic liquids can be a detrimental property in carrying out Diels-Alder reactions, if ionic liquids are employed as solvent media. It is possible to enhance the reaction rates of the reaction if a co-solvent is mixed in pure ionic liquid used as a solvent.

}, keywords = {Diels-Alder reactions, ionic liquids, kinetics, viscosity}, issn = {1674-7291}, doi = {10.1007/s11426-012-4684-9}, author = {Kumar, Anil and Pawar, Sanjay S.} } @article { ISI:000317399600014, title = {Hydrophobic and hydrophilic balance and its effect on mesophase behaviour in hydroxyalkyl ethers of methyl glucopyranoside}, journal = {Chemistry-A European Journal}, volume = {19}, number = {16}, year = {2013}, month = {APR}, pages = {5041-5049}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

Four series of monosubstituted methyl -D-glucopyranoside hydroxyalkyl ethers were prepared and their thermotropic and lyotropic self-organising properties were investigated in terms of the hydrophobichydrophilic balance with respect to their molecular structures. The results obtained lead us to a new understanding of the forces that drive the formation of condensed soft-matter phases.

}, keywords = {carbohydrates, liquid crystals, mesophases, Self-assembly, soft matter}, issn = {0947-6539}, doi = {10.1002/chem.201202933}, author = {Singh, Madan K. and Xu, Rui and Moebs, Sylvie and Kumar, Anil and Queneau, Yves and Cowling, Stephen J. and Goodby, John W.} }