Basic ruthenium acetate

BASIC RUTHENIUM ACETATE AND MIXED VALENCE DERIVATIVES... 

Basic Ruthenium Acetate and Mixed Valence Derivatives 157... 

Figure 1. Structure of basic ruthenium acetate framework.

To select the metal to be incorporated into the substrate porphyrin unit, the following basic properties of metalloporphyrins should be considered. The stability constant of MgPor is too small to achieve the usual oligomeric reactions and purification by silica gel chromatography. The starting material (Ru3(CO)i2) for Ru (CO)Por is expensive and the yield of the corresponding metalation reaction is low. Furthermore, the removal of rutheniirm is difficult, and it is likewise difficult to remove the template from the obtained ruthenium CPOs. Therefore, ZnPor is frequently used as a substrate in this template reaction, because of the low prices of zinc sources (zinc acetate and/or zinc chloride), the high yield in the metalation reaction, the sufficient chemical stability of the ZnPor under con-... 

Planar M30 units occur in the basic carboxylates of such metals as iron, ruthenium, manganese, vanadium and chromium the chromium compound has been known since 1919. The metal atoms are also linked by pairs of carboxylate ligands (often acetates), and have terminal ligands (generally pyridine or water). Mixed metal units, e.g. Fe2CrO,124 and mixed oxidation states, e.g. Ci CifO,1 ... 

The carbonylation of methanol to give acetic acid, according to Eq.(l), based on the catalyst [Rh(CO)2I2], is a major industrial process (Monsanto acetic acid process). However, ruthenium clusters as catalysts seem to favor the insertion of carbon monoxide into the O-H and not into the C-O bond, according to Eq.(2). Ru3(CO)12 in basic solution converts methanol to methyl formate with 90% selectivity (400-450 bar CO,... 

Wet air oxidation in the presence of carbon-supported ruthenium provides an efficient method for total destruction by air of organic acid pollutants in aqueous solutions. In the presence of high concentrations of NaCl salts or of mineral acids, the oxidation of succinic acid was not modified, whereas the rate of oxidation of acetic acid formed transiently, was slightly lowered. In neutral and basic media, the oxidation of the carboxylate ions was greatly decreased. No leaching of ruthenium was observed, which means that the reaction was catalyzed by a heterogeneous catalytic system. However, the carbon support was partially oxidized, which limits the application of this catalytic system for the CWAO of acetic acid, which requires temperatures close to 200°C. 

An alternative, but rather expensive, method of isolating pure 3/8-acetoxy-5a-lanosta-8,24-dien-3/3-yl acetate from commercial lanosterol has been described. Oxidation of the lanost-8-enes (12) with ruthenium dioxide-sodium periodate gives the 8,9-seco-8,9-diketones (13) together with lesser amounts of the corresponding 8-ene-7,ll-diketones. Under either acidic or basic conditions the former cyclize to afford the C(14a)-homo-B-norlanost-8-en-14a-ones... 

An efficient one-pot procedure for the iV-monomethylation of primary amines has been reported the method involves formylation with acetic formic anhydride followed by borane methyl sulphide reduction. The reaction sequence is applicable to even very weakly basic and sterically hindered amines, and the products are uncontaminated by over-alkylation. In addition, the transition-metal-catalysed j V-monoalkylation of amines by alcohols has been previously reported (c/. Vol. 6, p. 198) as a method to overcome problems associated with over-alkylation. A similar procedure for the preparation of unsymmetrical secondary (and tertiary) amines utilises a ruthenium catalyst, and is particularly suitable for the synthesis of cyclic amines. ... 

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