Ruthenium carbon containing

Scheme 10. Moss s convergent construction of organometallic dendrimers containing ruthenium-carbon o-bonds.

Several arene-ruthenium complexes containing bidentate phosphine ligands have been shown to be useful catalyst precursors for the hydration of terminal aryl alkynes 105 to afford acetophenones 106 (Scheme 29) [52]. For example, the cationic complex 104, when activated by AgSbH5, promoted addition of water to a carbon-carbon triple bond. It was found that such reactions proceeded slowly but in good to excellent yields. It is remarkable, that the water in commercial acetone was sufficient to achieve complete conversion to the product. 

Copolymers from ruthenium complexes and 3-methylthiophene or bithiophene are prepared in acetonitrile, propylene carbonate nitromethane, and dichloromethane. Acetonitrile is generally the best solvent for the incorporation of the ruthenium complex into the polymer film, the ruthenium complex content in films being higher than in propylene carbonate, nitromethane, and dichloromethane [656]. Propylene carbonate containing BU4NPF6 is used for the electrochemical polymerization of 3-alkyloxymethylthiophene [661]. 

As early as the middle of 1960s, BP successfully developed a kind of oleophylic graphite with excellent adsorption ability, and then a kind of graphited carbon in 1974, which could be used as supports for various catalysts. From 1978 to 1984, BP claimed a series of patents on ruthenium catalysts for ammonia synthesis. In 1979, ° a novel catalyst for ammonia synthesis was prepared by loading carbonyl compound of ruthenium on carbon containing graphite in laboratory. This kind of catalyst, with graphited carbon as support and Rus (CO) 12 as the precursor, possessed some special features that may be summarized as follows ... 

RuCls 3H2O is the most common ruthenium compound containing chlorine with stable properties. It easily dissolves in water and is cheaper than other ruthenium compounds. In the past, the ruthenium catalysts were prepared by impregnation with RuCIs as the precursor and water as solvent. However, the chlorine of remnant after reduction can poison the ruthenium catalysts when a metal oxide is adopted as a support. The poison effect of chlorine is not so obvious for ruthenimn catalysts with activated carbon as support. ... 

Ammonia synthesis process in which the converter contains a conventional iron catalyst in the inlet zone and a ruthenium/carbon catalyst in the exit zone. C. P. van Dijk, A. Solbakken, and B. G. Mandelik (M. W. Kellog Co.). US 4568531 (1986). 

Ammonia synthesis process in which the converter contains a conventional iron catalyst in the inlet zone and a ruthenium/carbon catalyst in the exit zone. 

Ligands Bonded through Carbon and Phosphorus 6.22.3.2.1 Ruthenium clusters containing oxygenated diphosphine ligands... 

Preparation of Ruthenium Tetroxide (/5) In a 250-ml flask equipped with a magnetic stirrer and cooled in an ice-salt bath is placed a mixture of 0.4 g of ruthenium dioxide and 50 ml of carbon tetrachloride. A solution of 3.2 g of sodium metaperiodate in 50 ml of water is added and the mixture is stirred 1 hour at 0°. The black ruthenium dioxide gradually dissolves. The clear yellow carbon tetrachloride layer is separated and filtered through glass wool to remove insoluble materials. The solution may be used immediately or stored in the cold in the presence of 50 ml of sodium metaperiodate solution (1 g/50 ml). As prepared above, the solution is about 0.037 M in ruthenium tetroxide and contains 0.3 g/50 ml. 

The unique power of Hoveyda s recyclable ruthenium catalyst D in RCM with electron-deficient and sterically demanding substrates is illustrated in Honda s total synthesis of the simple marine lactone (-)-malyngolide (54), which contains a chiral quaternary carbon center (Scheme 10) [35]. Attempted RCM of diene 52 with 5 mol% of NHC catalyst C for 15 h produced the desired... 

Diazoalkanes are u.seful is precursors to ruthenium and osmium alkylidene porphyrin complexes, and have also been investigated in iron porphyrin chemistry. In an attempt to prepare iron porphyrin carbene complexes containing an oxygen atom on the /(-carbon atom of the carbene, the reaction of the diazoketone PhC(0)C(Ni)CH3 with Fe(TpCIPP) was undertaken. A low spin, diamagnetic carbene complex formulated as Fe(TpCIPP)(=C(CH3)C(0)Ph) was identified by U V-visible and fI NMR spectroscopy and elemental analysis. Addition of CF3CO2H to this rapidly produced the protonated N-alkyl porphyrin, and Bit oxidation in the presence of sodium dithionitc gave the iron(II) N-alkyl porphyrin, both reactions evidence for Fe-to-N migration processes. ... 

Gonzalez ER, TicianeUi EA. 2005. Studies of CO tolerance on modified gas diffusion electrodes containing ruthenium dispersed on carbon. J Electroanal Chem 575 53-60. 

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