02066nas 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