01692nas a2200241   4500008004100000022001400041245017500055210006900230260010600299300001400405490000700419520072700426653002901153653000901182653001001191653003001201653001101231653000801242100002401250700003001274700002301304856012301327       2007                        eng d  a0957-416600aShort synthesis of (+)-harzialactone A and (R)-(+)-4-hexanolide via proline-catalyzed sequential alpha-aminooxylation and horner-wadsworth-emmons olefination of aldehydes0 aShort synthesis of harzialactone A and R4hexanolide via prolinec  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcAUG  a1795-17980 v183 a<p>{In melts, ring polymers assume more compact conformations compared to linear chains with the same degree of polymerization N-r, i.e. R-r similar to N-r(nu) with nu approximate to 0.4, where R-r is the radius of gyration. Upon gradually substituting some of the ring polymers with linear chains, the ring molecules swell. In the limit of infinite dilution, their size scales as R-r similar to N-r(0.5). We present a scaling argument based on the blob model to capture this transition. Ring-linear blends are modeled as a semidilute solution of ring polymers in a theta-solvent consisting of linear chains. The model predicts that the size of the ring polymer remains unchanged up to the overlap concentration c(r)(*</p>10acore-shell nanoparticles10aGold10aHRTEM10ainterfacial seeded growth10aSilver10aXPS1 aKotkar, Shriram, P.1 aSuryavanshi, Gurunath, S.1 aSudalai, Arumugarn  uhttps://library.ncl.res.in/content/short-synthesis-harzialactone-and-r-4-hexanolide-proline-catalyzed-sequential-alpha01185nas a2200169   4500008004100000022001400041245010800055210006900163260010600232300001400338490000700352520045800359100001800817700003000835700002200865856012800887       2008                        eng d  a0040-403900aShort enantioselective synthesis of (-)-bestatin via L-proline-catalyzed alpha-amination of an aldehyde0 aShort enantioselective synthesis of bestatin via Lprolinecatalyz  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcNOV  a6791-67930 v493 a<p>A short and high yielding enantioselective synthesis of (-)-bestatin, a naturally occurring aminopeptidase inhibitor, is described Via L-proline-catalyzed asymmetric alpha-amination of 3-phenylpropionaldehyde as the key reaction. The methodology also involves a Pd-catalyzed intramolecular cyclization of an allylic acetate giving a trans-oxazoline in a highly diastereoselective manner (dr &gt; 14:1). (C) 2008 Elsevier Ltd. All rights reserved.</p>1 aGeorge, Shyla1 aSuryavanshi, Gurunath, S.1 aSudalai, Arumugam  uhttps://library.ncl.res.in/content/short-enantioselective-synthesis-bestatin-l-proline-catalyzed-alpha-amination-aldehyde-0