- Ruthenium carbene-diether ligand complexes: Catalysts for hydrogenation of Olefins
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A series of carbene-diether ligands were prepared and the corresponding Ag salts used to prepare the complexes RuHCl(PPh3)2(Im(OR) 2) (Im(OR)2 = C3H2(NCH 2CH2OR)2; R = Me (4a), t-Bu (4b), tert-hexyl (4c), Ph (4d), 2,6-i-Pr2C6H3 (4e)). In an analogous fashion the species RuHCl(PPh3)2(Y 2Im(OMe)2) (Y2Im(OMe)2 = Y 2C3(NCH2CH2OMe)2; Y 2 = C6H4 (4f), Y = Cl (4g), Me (4h)) were also synthesized. Similarly RuHCl(CO)(PPh3)2(Im(OMe) 2) (5) was prepared and readily converted to RuHCl(CO)(SIMes)(Im(OMe) 2) (6) via treatment with SIMes. The reaction of 4a with SIMes afforded RuHCl(SIMes)(Im(OMe)2)(PPh3) (7), which reacts subsequently with Na[BPh4] to give [RuH(Im(OMe)2)(SIMes)] [(η6-Ph)BPh3] (8). In a series of tests, the species 4a-h, 5, 6, and 8 were shown to catalyze the hydrogenations of 1-hexene, cyclohexene, and dimethyl itaconate. From the activity of 4a-h it is clear that the capability of the carbene-ether substituents to coordinate to the metal as well as electron-donating substituents on the carbene fragment enhances catalytic activity. Other variations such as in 5, 6, and 8 resulted in terminal-olefin-selective hydrogenation catalysts, although the zwitterionic species 8 showed significantly enhanced activity.
- Wang, Tongen,Pranckevicius, Conor,Lund, Clinton L.,Sgro, Michael J.,Stephan, Douglas W.
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p. 2168 - 2177
(2013/05/21)
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- Synthesis, spectroscopy and structural characterization of silver(I) complexes containing unidentate N-donor azole-type ligands
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From the interaction between azole-type ligands L and AgX (X = NO 3 or ClO4) or [AgX(PPh3)n] (X = Cl, n = 3; X = MeSO3, n = 2), new ionic mononuclear [Ag(L)2]X and [Ag(PPh3)3L][X] or neutral mono-([Ag(PPh 3)nL(X)]) or di-nuclear ([{Ag(PPh3)(L)(μ-X)} 2]) complexes have been obtained which have been characterized through elemental analysis, conductivity measurements, IR, 1H NMR and, in some cases, also by 31P{1H} NMR spectroscopy, and single-crystal X-ray studies. Stoichiometries and molecular structures are dependent on the nature of the azole (steric hindrance and basicity), of the counter ion, and on the number of the P-donor ligands in the starting reactants. Solution data are consistent with partial dissociation of the complexes, occurring through breaking of both Ag-N and Ag-P bonds.
- Effendy,Marchetti, Fabio,Pettinari, Claudio,Pettinari, Riccardo,Pizzabiocca, Adriano,Skelton, Brian W.,White, Allan H.
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p. 1504 - 1512
(2008/10/09)
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- Syntheses and reactivity of acetylide-containing clusters of Group IB metals. Preparation, structure, and reactions of the tetranuclear cluster . Syntheses and structure of the novel mixed-metal gold-silver and gold-copper phenylacet
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The tetranuclear cluster has been made by reaction of with n> (1/1).Its structure and reactions are described.The novel mixed gold-silver and gold-copper phenylacetylide polymers n> (M = Ag, Cu)
- Abu-Salah, Omar M.
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p. 123 - 129
(2007/10/02)
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- Synthesis of Pentafluorophenyl(ylide)silver(I) Complexes: X-Ray Structures of two Modifications of
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Monomeric silver ylide complexes (ER3=PPh3, PPh2Me, PPhMe2, or AsPh3) can be prepared by the reaction of Ag(CF3CO2) with Li(C6F5) and .The free ylides CH2PPh3, CH2PPh2Me, or CH(CO2Me)PPh3 react with Ag(C6F5) or AgClO4 to afford or ClO4 respectively.Several novel ylide-transfer reactions from silver ylides to other silver or gold centres are reported.The structures of two forms of have been established.The molecules differ mainly in the orientation of one phenyl ring.The C6F5 groups are highly distorted at the ipso carbon .
- Uson, Rafael,Laguna, Antonio,Uson, Alfredo,Jones, Peter G.,Meyer-Baese, Karen
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p. 341 - 346
(2007/10/02)
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- Synthesis and reaction studies of phthaloylcobalt cations. Application to naphthoqulnone synthesis
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Cationic phthaloylcabalt complesee 3-7 havt bwn pwpard by reaction of dtiorcobdh phtholoyl complex 1 with AgBF4 ffJlowwl by irauant with the appropriate ligimd. RtncUon of Lae cutionic cnraplwa wilh dkyns produced luphthoqulnuse, diid lh mecbanittic nature af ths results is diacuiwd. The cafionic cobalt complex 6 with a chelatmg diphoa bgand wai found to rapidly give high yields of nub Ututad naphthoquinonea on treatment with fuiicuonaliied alkynao in CH2Cl2.
- Baysdon, Sherrol L.,Liebeskind, Lanny S.
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p. 771 - 775
(2008/10/08)
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