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-002573nas a2200205   4500008004100000022001400041245015500055210006900210260009300279300001200372490000700384520171700391653001802108653001502126653003502141653002402176653001402200100002302214856013002237       2011                        eng d  a1004-954100aTransport of indium, gallium and thallium metal ions through chromatographic fiber supported solid membrane in acetylacetone containing mixed solvents0 aTransport of indium gallium and thallium metal ions through chro  aNO. 3 HUIXINLI CHAOYANGQU, BEIJING 100029, PEOPLES R CHINAbCHEMICAL INDUSTRY PRESScDEC  a955-9630 v193 a<p>The transport of metal ions of indium, gallium and thallium from source solution to receiving phase through the chromatographic fiber supported solid membrane in the acetylacetone (HAA) containing mixed solvent system has been explored. The fibers supported solid membranes were prepared with chemical synthesis from cellulose fibers and citric acid with the carboxylic acid ion exchange groups introduced. The experimental variables, such as concentration of metal ions (10(-2) to 10(-4) mol.L(-1)) in the source solution, mixed solvent composition [for example, acetylacetone, (2,4-pentanedione), (HAA) 20% (by volume), 1,4-dioxane 10% to 60% and HCl 0.25 to 2 mol.L(-1)] in the receiving phase and stirring speed (50-130 r.min(-1)) of the bulk source and receiving phase, were explored. The efficiency of mixed solvents for the transport of metal ions from the source to receiving phase through the fiber supported solid membrane was evaluated. The combined ion exchange solvent extraction (CIESE) was observed effective for the selective transport of thallium, indium and gallium metal ions through fiber supported solid membrane in mixed solvents. The oxonium salt formation in the receiving phase enhances thallium, indium and gallium metal ion transport through solid membrane phase. The selective transport of thallium metal ions from source phase was observed from indium and gallium metal ions in the presence of hydrochloric acid in organic solvents in receiving phase. The separation of thallium metal ions from the binary mixtures of Be(II), Ti(IV), Al(III), Ca(II), Mg(II), K (I), La(III) and Y(III) was carried out in the mixed solvent system using cellulose fiber supported solid membrane.</p>10aacetylacetone10aextraction10afiber supported solid membrane10ametal ions transfer10astripping1 aGaikwad, Abaji, G.  uhttps://library.ncl.res.in/content/transport-indium-gallium-and-thallium-metal-ions-through-chromatographic-fiber-supported-0