- Transition metal nanoparticles stabilized by ammonium salts of hyperbranched polystyrene: effect of metals on catalysis of the biphasic hydrogenation of alkenes and arenes
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Abstract Hyperbranched polystyrene bearing ammonium salts (HPS-NR3+Cl-) behaves as an excellent stabilizer of ruthenium, rhodium, iridium, palladium, and platinum nanoparticles from 1 to 3 nm in size uniformly dispersed in the polymer matrix. The catalytic performance of the resulting metal-polymer composites, M@HPS-NR3+Cl-, is dependent on the metal. This dependence was investigated by assessing the hydrogenation of alkenes and arenes. The utility of M@HPS-NR3+Cl- as reusable catalysts in aqueous/organic biphasic systems was demonstrated by examining the catalysis of the hydrogenation of aromatic compounds containing various functional groups by Ru@HPS-NR3+Cl-.
- Gao, Lei,Kojima, Keisuke,Nagashima, Hideo
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supporting information
p. 6414 - 6423
(2015/08/18)
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- Chemoselective hydrogenation of functionalized nitroarenes and imines by using carbon nanofiber-supported iridium nanoparticles
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The reaction of three types of carbon nanofibers (CNFs; platelet: CNF-P, tubular: CNF-T, herringbone: CNF-H) with Ir4(CO)12 in mesitylene at 165 °C provided the corresponding CNF-supported iridium nanoparticles, Ir/CNFs (Ir content=2.3-2.6 wt. %). Transmission electron microscopy (TEM) studies of these Ir/CNF samples revealed that size-controlled Ir nanoparticles (average particle size of 1.1-1.5 nm) existed on the CNFs. Among the three Ir/CNF samples, Ir/CNF-T showed an excellent catalytic activity and chemoselectivity towards hydrogenation of functionalized nitroarenes and imines; the corresponding aniline derivatives were obtained with high turnover numbers at ambient temperature under 10 atm of H2, and the catalyst is reusable. Ir/CNF-T was also effective for the reductive N-alkylation of anilines with carbonyl compounds.
- Motoyama, Yukihiro,Taguchi, Masahiro,Desmira, Nelfa,Yoon, Seong-Ho,Mochida, Isao,Nagashima, Hideo
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- ANALGESIC THAT BINDS FILAMIN A
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A compound, composition and method are disclosed that can provide analgesia. A contemplated compound has a structure that corresponds to Formula A, wherein A, B, X, R1, R2, R7 and R8, and the dashed lines are defined within.
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Page/Page column 78; 79
(2010/05/14)
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- Rhodium nanoparticles supported on carbon nanofibers as an arene hydrogenation catalyst highly tolerant to a coexisting epoxido group
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Rhodium nanoparticles supported on a carbon nanofiber (Rh/CNF-T) show high catalytic activity toward arene hydrogenation under mild conditions in high turnover numbers without leaching the Rh species; the reaction is highly tolerant to epoxido groups, which often undergo ring-opening hydrogenation with conventional catalysts.
- Motoyama, Yukihiro,Takasaki, Mikihiro,Yoon, Seong-Ho,Mochida, Isao,Nagashima, Hideo
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supporting information; experimental part
p. 5042 - 5045
(2009/12/28)
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- Selective hydrogenation of aromatic compounds containing epoxy group over Rh/graphite
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Catalytic hydrogenation of aromatic compounds containing epoxy group to alicylic compounds has been investigated. Rh supported on graphite with high surface area exhibited superior performance to other supported catalysts for the selective reduction of the aromatic group while retaining epoxy group.
- Hara, Yoshinori,Inagaki, Hiroko
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p. 1116 - 1117
(2007/10/03)
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- A catalytic stereo- and chemo-selective method for the reduction of substituted aromatics
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Various substituted aromatics have been reduced using colloidal ruthenium under H2 pressure with good stereoselectivity (cis/trans up to 60). Interesting chemoselectivities are also observed.
- Fache,Lehuede,Lemaire
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p. 885 - 888
(2007/10/02)
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- Selective reduction of the carbon - bromine bond in bromo epoxides
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The controlled-potential electrolysis of various substituted bromo epoxides in acetonitrile at a mercury pool electrode led to selective reduction of the carbon-bromine bond affording the respective epoxide products in 80-90% yield.
- Bhuvaneswari,Venkatachalam,Balasubramanian
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p. 1499 - 1502
(2007/10/02)
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- DEPLACEMENTS HOMOLYTIQUES INTRAMOLECULAIRES III-DECOMPOSITION DU PEROXYDE D'ALLYLE ET DE t-BUTYLE DANS LES ETHERS ET LES CYCLANES: EPOXY-2,3 PROPANATION DE CES SOLVANTS
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Product analysis of the thermolysis of allyl t-butyl peroxide in cyclohexane and tetrahydrofuran shows that an important induced decomposition of the peroxide occurs by the addition of radicals derived from the solvent, to the peroxide double bond, followed by an intramolecular homolytic displacement of the t-butoxyl group.Such a reaction is a 2,3-epoxypropanation of the solvent in which the initiator is decomposed.The reaction is shown to be general, by using other ethers and cycloalkanes as solvents.
- Maillard, B.,Montaudon, E.,Rakotomanana, F.,Bourgeois, M. J.
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p. 5039 - 5044
(2007/10/02)
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