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-001453nas a2200229   4500008004100000022001400041245016900055210006900224260007300293300001200366490000800378520054500386653000600931653000600937653003700943653003600980653002501016653002101041100002001062700001701082856012401099       2011                        eng d  a0926-860X00aImmobilization of 1,5,7-triazabicyclo [4.4.0] dec-5-ene over mesoporous materials: an efficient catalyst for michael-addition reactions under solvent-free condition0 aImmobilization of 157triazabicyclo 440 dec5ene over mesoporous m  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a250-2580 v3973 a<p>Immobilization of 1,5,7-triazabicyclo [4.4.0] dec-5-ene (TBD, a bicylic guanidine base) over mesoporous material like SBA-15 has been found to be an excellent catalyst for Michael-addition of beta-nitro styrene with malonate. The reactions were performed under solvent-free condition at 373 K for 9 h. A wide variety of Michael donors and acceptors were investigated. Among them, high yield of Michael product was obtained for the reaction between p-Cl-nitrostyrene with dimethyl malonate. (C) 2011 Elsevier B.V. All rights reserved.</p>10a110a510a7-triazabicyclo[4.4.0] dec-5-ene10abeta-nitro styrene and malonate10amesoporous materials10aMichael-addition1 aKalita, Pranjal1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/immobilization-157-triazabicyclo-440-dec-5-ene-over-mesoporous-materials-efficient-0