02024nas a2200289 4500008004100000022001400041245014200055210006900197260007600266300001400342490000600356520097700362653001201339653002801351653001801379653002501397653001201422100001401434700001701448700003501465700002101500700002101521700001801542700002201560700002201582856013001604 2010 eng d a1867-388000aCovalently immobilized triphenylphosphine rhodium complex: synthesis, characterization, and application in catalytic olefin hydrogenation0 aCovalently immobilized triphenylphosphine rhodium complex synthe aCOMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USAbWILEY-BLACKWELLcNOV a1477-14820 v23 a

A trimethoxysilane functionalized triphenylphosphine was coordinated to rhodium(I) and the resulting rhodium complex was covalently bound to a mesoporous SBA-15 support. The catalytic activity of this hybrid material was studied for the hydrogenation of 2-cyclohexen-1-one and compared with the corresponding homogeneous catalyst. According to the (31)P-MAS NMR data, the catalytically active species was stable against oxidation; no structural change could be detected after exposing it to air for more than two months. Transmission electron microscopy (TEM) measurements on the used catalyst confirmed that the rhodium species was also stable against reduction to the metal because the formation of rhodium nanoparticles during the catalysis could be excluded. The kinetic curves of the recycled system confirmed that this hybrid catalyst shows excellent activity, selectivity, stability, and reusability, and is truly heterogeneous in the hydrogenation reaction.

10aalkenes10aheterogeneous catalysis10aHydrogenation10amesoporous materials10aRhodium1 aWang, Lei1 aJia, Mingjun1 aShylesh, Sankaranarayanapillai1 aPhilippi, Thomas1 aSeifert, Andreas1 aErnst, Stefan1 aSingh, Anand, Pal1 aThiel, Werner, R. uhttps://library.ncl.res.in/content/covalently-immobilized-triphenylphosphine-rhodium-complex-synthesis-characterization-and-001808nas a2200265 4500008004100000022001400041245013000055210006900185260007300254300001000327490000700337520084900344653002101193653001801214653001701232653001401249653002401263100002201287700001701309700003501326700001401361700002201375700002201397856012301419 2012 eng d a1566-736700aCovalently anchored ruthenium-phosphine complex on mesoporous organosilica: catalytic applications in hydrogenation reactions0 aCovalently anchored rutheniumphosphine complex on mesoporous org aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG a22-270 v253 a

New heterogeneous catalysts for alkene hydrogenation reactions were prepared by the immobilization of trimethoxysilane functionalized triphenylphosphine eta(6)-p-cymene ruthenium complex on mesoporous organosilica (PMO-Ru). Characterization techniques confirmed the structural integrity of the organosilica material and proved the successful anchoring of ruthenium complex. Catalytic activity and stability of PMO-Ru sample investigated in the hydrogenation of various olefins showed higher activity than a neat and MCM-41 supported ruthenium catalyst. High catalytic activity and stability of organosilica supported ruthenium catalyst are attributed to the hydrophobic environments and to the unique structural features imparted from the presence of organic groups in the framewall positions. (C) 2012 Elsevier B.V. All rights reserved.

10aHeterogenization10aHydrogenation10aOrganosilica10aruthenium10aTriphenyl phosphine1 aSisodiya, Sheetal1 aLazar, Anish1 aShylesh, Sankaranarayanapillai1 aWang, Lei1 aThiel, Werner, R.1 aSingh, Anand, Pal uhttps://library.ncl.res.in/content/covalently-anchored-ruthenium-phosphine-complex-mesoporous-organosilica-catalytic-002198nas a2200265 4500008004100000022001400041245012100055210006900176260011000245300001400355490000600369520120900375100001401584700001701598700002101615700002101636700001801657700001501675700002101690700002801711700002201739700001701761700002201778856013201800 2012 eng d a2044-475300aElectrostatic grafting of a triphenylphosphine sulfonate on SBA-15: application in palladium catalyzed hydrogenation0 aElectrostatic grafting of a triphenylphosphine sulfonate on SBA1 aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcFEB a1188-11950 v23 a

A novel strategy for the immobilization of a sulfonate functionalized triphenylphosphine ligand by ion-ion interactions on an imidazolium modified SBA-15 is presented. A support containing electrostatically grafted triphenylphosphine as the ligand was reacted with PdCl2( CNPh)(2) and the resulting hybrid material catalyzed olefin hydrogenation under mild conditions. The catalyst exhibits excellent activity, selectivity and stability and it can be reused for at least ten times without any loss of activity. An analogous but covalently grafted palladium system does not show any hydrogenation activity under the same conditions. TEM images of the used catalyst clearly prove the absence of palladium nanoparticles. Additionally, XPS investigations prove that palladium( 0) is formed and the phosphine is oxidized. By AAS no palladium contamination down to 0.5 X 10(-4) mmol could be detected in the products and further leaching tests verified the reaction to be truly heterogeneous. This concept of non-covalent immobilization guarantees a tight bonding of the catalytically active species to the surface in combination with a high mobility, which should be favorable for other catalyses, too.

1 aWang, Lei1 aDehe, Daniel1 aPhilippi, Thomas1 aSeifert, Andreas1 aErnst, Stefan1 aZhou, Zhou1 aHartmann, Martin1 aTaylor, Robin, N. Klupp1 aSingh, Anand, Pal1 aJia, Mingjun1 aThiel, Werner, R. uhttps://library.ncl.res.in/content/electrostatic-grafting-triphenylphosphine-sulfonate-sba-15-application-palladium-catalyzed-002933nas a2200169 4500008004100000022001400041245018600055210006900241260011000310300001600420490000600436520213700442100001702579700002202596700001802618856012702636 2014 eng d a2046-206900aSynthesis and characterization of 3-[N,N `-bis-3-(salicylidenamino)ethyltriamine] Mo(VI)O-2@SBA-15: a highly stable and reusable catalyst for epoxidation and sulfoxidation reactions0 aSynthesis and characterization of 3NN bis3salicylidenaminoethylt aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAR a14063-140730 v43 a

The efficient and reusable oxidation catalyst 3-[N,N'-bis-3-(salicylidenamino)ethyltriamine] Mo(VI)O-2@SBA-15 has been synthesized by the anchoring of the 3-[N,N-bis-3-(salicylidenamino)ethyltriamine] ligand (L or Salpr) on the inner surfaces of organofunctionalized SBA-15 and subsequent complexation with Mo(VI) O-2(acac)(2). The physico-chemical properties of the functionalized catalysts were analyzed by elemental analysis, ICP-OES, XRD, N-2-sorption measurements, TG & DTA, solid state C-13, Si-29 NMR spectroscopy, FT-IR, Raman spectroscopy, XPS, DRS UV-Vis spectroscopy, SEM and TEM. XRD and N-2 sorption analyses helped to find out the morphological and textural properties of the synthesized catalysts and confirm that an ordered mesoporous channel structure was retained even after the multistep synthetic procedures. The (100), (110) and (200) reflections in SBA-15 provide hints of a good structural stability, the existence of long range ordering and a high pore wall thickness. TG and DTA results reveal that the thermal stability of (L)Mo(VI)O-2@SBA-15 was maintained up to 300 degrees C. The organic moieties anchored over the surface of the SBA-15 support were determined by solid state C-13 NMR and FT-IR spectroscopy. Further, solid state Si-29 NMR spectroscopy provides the information about the degree of functionalization of the surface silanol groups with the organic moiety. The electronic environment and the oxidation state of the molybdenum site in (L)Mo(VI)O-2@SBA-15 were monitored by Raman spectroscopy, XPS and DRS UV-Vis techniques. Moreover, the morphology and topographic information of the synthesized catalysts were confirmed by SEM and TEM imaging. The synthesized catalysts were evaluated in epoxidation and sulfoxidation reactions, and the results show that (L)Mo(VI)O-2@SBA-15 exhibits high conversion and selectivity towards epoxidation and sulfoxidation reactions in combination with high stability. The anchored solid catalysts can be recycled effectively and reused several times without major loss in activity. In addition, Sheldon's hot filtration test was also carried out.

1 aLazar, Anish1 aThiel, Werner, R.1 aSingh, A., P. uhttps://library.ncl.res.in/content/synthesis-and-characterization-3-nn-bis-3-salicylidenaminoethyltriamine-movio-2sba-15-0