02025nas a2200241   4500008004100000022001400041245011900055210006900174260010600243300001400349490000700363520106900370653002401439653003401463653003301497653002501530653001401555100002301569700002101592700001701613700002201630856013101652       2010                        eng d  a0277-538700aEfficient heterogeneous catalytic system for chemoselective hydrogenation of unsaturated ketones in aqueous medium0 aEfficient heterogeneous catalytic system for chemoselective hydr  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcNOV  a3262-32680 v293 a<p>A highly chemoselective and green heterogeneous catalytic system of immobilized Ru(II)-phenanthroline complexes on amino functionalised MCM-41 material for the chemoselective hydrogenation of unsaturated ketones to unsaturated alcohols is demonstrated using water as a solvent The XRD and FTIR spectra show the highly ordered hexagonal nature of the MCM-41 even after encapsulation of the ruthenium complex The complex retains its configuration after anchoring as was confirmed by FTIR and UV-Vis analysis The detailed reaction parametric effect was studied for the hydrogenation of 3 methylpent-3-en-2-one to achieve complete conversion up to &gt;99% chemoselectivity of 3-methylpent-3-en-2 ol The anchored heterogeneous catalysts were recycled effectively and reused five times with marginal changes in activity and selectivity The use of water as a solvent not only afforded high activity for the hydroge nation reaction compared to organic solvents but also afforded a green process Crown Copyright (C) 2010 Published by Elsevier Ltd All rights reserved</p>10a1 10 Phenanthroline10aalpha beta Unsaturated ketone10aChemoselective hydrogenation10amesoporous materials10aruthenium1 aDeshmukh, Amit, A.1 aKinage, Anil, K.1 aKumar, Rajiv1 aMeijboom, Reinout  uhttps://library.ncl.res.in/content/efficient-heterogeneous-catalytic-system-chemoselective-hydrogenation-unsaturated-ketones-002066nas a2200277   4500008004100000022001400041245012400055210006900179260007300248300001200321490000800333520109900341653002601440653001801466653001901484653001301503653001801516653001901534653001401553653001001567100002301577700002101600700001701621700002201638856012801660       2010                        eng d  a1381-116900aHeterogenized Ru(II) phenanthroline complex for chemoselective hydrogenation of diketones under biphasic aqueous medium0 aHeterogenized RuII phenanthroline complex for chemoselective hyd  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC  a114-1200 v3333 a<p>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.</p>10a4-Hydroxypentan-2-one10aacetylacetone10aChemoselective10aDiketone10aHydrogenation10aPhenanthroline10aruthenium10aWater1 aDeshmukh, Amit, A.1 aKinage, Anil, K.1 aKumar, Rajiv1 aMeijboom, Reinout  uhttps://library.ncl.res.in/content/heterogenized-ruii-phenanthroline-complex-chemoselective-hydrogenation-diketones-under-0