01699nas a2200241 4500008004100000022001400041245007800055210006900133260009500202300001400297490000600311520088200317653001901199653000901218653001201227653001601239653001801255653002301273100002001296700001701316700001901333856010501352 2005 eng d a1533-488000aSynthesis of gold nanospheres and nanotriangles by the Turkevich approach0 aSynthesis of gold nanospheres and nanotriangles by the Turkevich a25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USAbAMER SCIENTIFIC PUBLISHERScOCT a1721-17270 v53 a

Gold nanoparticles of triangular morphology possess interesting optical properties with potential application in medicine and infrared absorbing coatings, however, little is known about conditions that favor their growth. In this paper, we have reinvestigated a time-tested recipe for the formation of gold nanospheres by citrate reduction of aqueous gold ions under boiling conditions (Turkevich recipe). Our principle findings are that gold nanotriangle formation is kinetically controlled and is highly favored at low temperatures. Furthermore, the presence of chloride ions from the precursor chloroaurate ions plays a major role in promoting the growth of [111] oriented triangular/truncated triangular particles. The presence of bromide and iodide ions that possess the ability to replace surface-bound chloride ions inhibits triangle formation to varying degrees.

10aCrystal growth10aGold10ahalides10ananospheres10ananotriangles10aTemperature effect1 aShankar, S., S.1 aBhargava, S.1 aSastry, Murali uhttps://library.ncl.res.in/content/synthesis-gold-nanospheres-and-nanotriangles-turkevich-approach-102700nas a2200241 4500008004100000022001400041245009100055210006900146260007300215300001200288490000800300520186300308653000902171653002302180653001902203653001202222653001702234653001702251100002602268700001602294700002602310856012202336 2006 eng d a1381-116900aFactors influencing decomposition of H2O2 over supported Pd catalyst in aqueous medium0 aFactors influencing decomposition of H2O2 over supported Pd cata aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a115-1200 v2603 a

Since H2O2 decomposition can result in selectivity/yield loss in the direct H2O2 synthesis process from H-2 and O-2 over supported Pd catalysts, it is important to have an enhanced understanding about the factors affecting the H2O2 decomposition reaction. Herein, detailed studies have been undertaken to investigate the influence of different factors, such as (a) nature and concentration of acid in reaction medium, (b) nature and concentration of halide in presence and absence of acid in reaction medium, (c) pretreatment procedures and (d) catalyst modification by incorporation of different halides, on the H2O2 decomposition reaction over a 5% Pd/C catalyst in aqueous medium at 25 degrees C. This study has shown that the H2O2 decomposition activity is profoundly influenced by all the above factors. The effectiveness of the acids in suppressing the H2O2 decomposition activity decreased in the following order: hydroiodic acid > hydrobromic acid > hydrochloric acid >> acetic acid > phosphoric acid > sulfuric acid > perchloric acid. The ability of the acid to decrease the H2O2 decomposition activity was found to very strongly depend on the nature of its associated anion. Halides, such as iodide, bromide and chloride were particularly effective in suppressing the H2O2 decomposition activity. Oxidation pretreatment of the catalyst was found to strongly suppress its H2O2 decomposition activity, while a reduction treatment was found to promote its activity. A gradual decrease in the H2O2 decomposition activity of the catalyst was observed with each successive usage due to in situ sub-surface oxidation of Pd by H2O2. Halide incorporation either via the reaction medium or prior catalyst modification had a similar qualitative effect on the H2O2 decomposition activity. (c) 2006 Elsevier B.V. All rights reserved.

10aacid10aH2O2 decomposition10aH2O2 synthesis10ahalides10aPd catalysts10apretreatment1 aChoudhary, Vasant, R.1 aSamanta, C.1 aChoudhary, Tushar, V. uhttps://library.ncl.res.in/content/factors-influencing-decomposition-h2o2-over-supported-pd-catalyst-aqueous-medium-000820nas a2200217 4500008004100000022001400041245008900055210006900144260007300213300001400286490000600300520003200306653001800338653002600356653001200382653001300394100002300407700002500430700002900455856011800484 2007 eng d a1566-736700aTethered Pd-complex on solid support: catalyst for acid-free carbonylation reactions0 aTethered Pdcomplex on solid support catalyst for acidfree carbon aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcSEP a1386-13920 v83 a

{Palladium complex [

10adecomposition10adirect H2O2 synthesis10ahalides10aPromoter1 aSarkar, Bibbas, R.1 aMukhopadhyay, Kausik1 aChaudhari, Raghunath, V. uhttps://library.ncl.res.in/content/tethered-pd-complex-solid-support-catalyst-acid-free-carbonylation-reactions-001378nas a2200301 4500008004100000022001400041245008300055210006900138260000800207300001500215490000700230520045900237653001500696653002400711653001300735653002000748653001200768653001800780653001200798653001600810653001600826653003000842100002200872700002000894700002600914700002500940856011100965 2017 eng d a1477-052000aNickel-catalyzed N-vinylation of heteroaromatic amines via C-H bond activation0 aNickelcatalyzed Nvinylation of heteroaromatic amines via CH bond cSEP a 6896-69000 v153 a

Here, we report a ligand- and reductant-free nickel-catalyzed N-vinylation of heteroaromatic amines using biorenewable p-cymene as a solvent. This unprecedented cross-coupling strategy has high functional group tolerance (halides, alkoxy, cyano, chiral motif, etc.) and proceeded via C-H bond activation.

10aAlkylation10aAmination Reactions10aAnilines10aAryl Chlorides10ahalides10aMonoarylation10aO Bonds10aPrecatalyst10aPyrimidines10aRemoveble Directing Group1 aLandge, Vinod, G.1 aRana, Jagannath1 aSubaramanian, Murugan1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/nickel-catalyzed-n-vinylation-heteroaromatic-amines-c-h-bond-activation