@article { ISI:000231389200051, title = {Gold nanoparticle networks with photoresponsive interparticle spacings}, journal = {Langmuir}, volume = {21}, number = {17}, year = {2005}, month = {AUG}, pages = {7979-7984}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

Photoresponsive gold nanoparticle networks were prepared by functionalizing them with azobenzene derivatives. A network can be formed when a linker molecule constituting the azobenzene moiety suitably derivatized on either side with gold surface sensitive groups such as thiols and amines is added to the nanoparticle solution. It is shown that the interparticle spacing in the networks could be controlled by the reversible trans-cis isomerization of the azobenzene moiety induced by UV and visible light, respectively. The photoinduced variation in the interparticle spacings is inferred by the changes in the optical spectra of the gold nanoparticles which display a red or blue shift in the surface plasmon resonance peak depending on a decrease or increase in the interparticle spacing, respectively. Transmission electron microscopy images are in consonance with the evidence from the optical spectra.

}, issn = {0743-7463}, doi = {10.1021/la051125q}, author = {Sidhaye, D. S. and Kashyap, Sudhir and Sastry, M. and Hotha, Srinivas and Bhagavatula L. V. Prasad} } @article { ISI:000259381100010, title = {Gold mediated glycosylations: selective activation of propargyl 1,2-orthoesters in the presence of aglycones containing a propargyl moiety}, journal = {Chemical Communications}, number = {36}, year = {2008}, month = {JUL}, pages = {4282-4284}, publisher = {ROYAL SOC CHEMISTRY}, type = {Article}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Selective activation of propargyl 1,2-orthoesters in the presence of propargyl glycosides and propargyl ethers was studied; a catalytic amount of AuBr(3) activated the propargyloxy, group of the 1,2-orthoester thereby giving access to disaccharides with the propargyl group at the reducing end; furthermore, propargyl ethers were unaffected under the reaction conditions.

}, issn = {1359-7345}, doi = {10.1039/b806707d}, author = {Sureshkumar, Gopalsamy and Hotha, Srinivas} } @article { ISI:000283697400015, title = {Gold-catalyzed glycosidations: synthesis of 1,6-anhydro saccharides}, journal = {Tetrahedron Letters}, volume = {51}, number = {45}, year = {2010}, month = {NOV}, pages = {5912-5914}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

Various 1,6-anhydro sugars are synthesized utilizing salient features of gold-catalyzed glycosidations. All the reactions occurred under mild conditions in the presence of 7 mol \% of AuBr(3) enabling easy synthesis of 1,6-anhydro sugars from corresponding 6-hydroxy propargyl/methyl monosaccharides, disaccharides, and trisaccharides in good yields. (C) 2010 Elsevier Ltd. All rights reserved.

}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2010.09.004}, author = {Thadke, Shivaji A. and Hotha, Srinivas} } @article { ISI:000282200300012, title = {Gold-catalyzed glycosidations: unusual cleavage of the interglycosidic bond while studying the armed/disarmed effect of propargyl glycosides}, journal = {Tetrahedron Letters}, volume = {51}, number = {40}, year = {2010}, month = {OCT}, pages = {5269-5272}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

Armed/disarmed effect of propargyl glycosides in the presence of AuBr(3) is studied. Observed that oxophilic AuBr(3) cleaves interglycosidic bond of an armed disaccharide resulting in the formation of a disaccharide and a 1,6-anhydro sugar. Trisaccharides were obtained after fine tuning the reactivity of the glycosyl donor with different protecting groups. (C) 2010 Elsevier Ltd. All rights reserved.

}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2010.07.157}, author = {Kayastha, Abhijeet K. and Hotha, Srinivas} } @article { ISI:000292852100017, title = {Gold catalyzed glycosidations for the synthesis of sugar acrylate/acrylamide hybrids and their utility}, journal = {Carbohydrate Research}, volume = {346}, number = {12, SI}, year = {2011}, month = {SEP}, pages = {1511-1518}, publisher = {ELSEVIER SCI LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

Propargyl glyco 1,2-orthoesters were exploited for the efficient synthesis of interesting glycomonomers such as glyco-acrylates and acrylamides using gold catalysts. It was observed that propargyl glyco 1,2-orthoesters with hydroxyethyl acrylates gives very good yield of the corresponding glyco-acrylates in a single step in the presence of catalytic amount of gold(III) catalyst; whereas, gold catalyzed glycosidation reaction on hydroxyethyl acrylamides was found to yield the corresponding acrylamidoyl 1,2-orthoester which was then converted to the corresponding glycol-acrylamide in the presence of catalytic amount of TMSOTf. Synthesized glyco-acrylate/acrylamide monomers are shown to undergo thiolate addition as well as free radical polymerization (C) 2011 Elsevier Ltd. All rights reserved.

}, keywords = {carbohydrates, Glycoacrylamides, Glycoacrylates, Glycopolymers, glycosylation, Gold}, issn = {0008-6215}, doi = {10.1016/j.carres.2011.04.018}, author = {Thadke, Shivaji A. and Kar, Mritunjoy and Sen Gupta, Sayam and Hotha, Srinivas} }