Dimanganese decacarbonyl

The reaction between 2,2 -biphosphole and dimanganese decacarbonyl was studied under different conditions [86JOM(316)271]. In boiling xylene and under inert atmosphere, the main product is the isomeric bis(ri -diphospholyl) complex 186, and complexes 187 and 188 are also produced. When performing the reaction in a closed vessel and at 420 K, the new tt complex 189 is formed. 

B. Arregui, B. Lopez, M.G. Salom, F. Valero, C. Navarro, and F.J. Fenoy, Acute renal hemodynamic effects of dimanganese decacarbonyl and cobalt protoporphyrin. Kidney Int. 65, 564-574 (2004). 

Nitroarenes are reduced to anilines (>85%) under the influence of metal carbonyl complexes. In a two-phase system, the complex hydridoiron complex [HFe,(CO)u]2-is produced from tri-iron dodecacarbonyl at the interface between the organic phase and the basic aqueous phase [7], The generation of the active hydridoiron complex is catalysed by a range of quaternary ammonium salts and an analogous hydrido-manganese complex is obtained from dimanganese decacarbonyl under similar conditions [8], Virtually no reduction occurs in the absence of the quaternary ammonium salt, and the reduction is also suppressed by the presence of carbon monoxide [9], In contrast, dicobalt octacarbonyl reacts with quaternary ammonium fluorides to form complexes which do not reduce nitroarenes. 

Finally, manganese carbonyl complexes also show potential for effecting interesting phase transfer catalyzed carbonylation reactions. Alkynes react with carbon monoxide and methyl iodide in methylene chloride, using 5N NaOH as the aqueous phase, benzyl-triethylammonium chloride as the phase transfer catalyst, and either bromopentacarbonylmanganese or dimanganese decacarbonyl to afford... 

Dimanganese decacarbonyl reacts with optically active silanes, but the complex cannot be crystallized ... 

Formula Mn2(CO)io MW 389.99 manganese in zero oxidation state. Synonyms dimanganese decacarbonyl manganese carbonyl... 

The best method for preparation of pentacarbonylchloromanganese is the reaction of chlorine with dimanganese decacarbonyl in carbon tetrachloride solution. Earlier versions of this procedure2 often give low yields however, the present version is reliable and produces a good yield. 

Chromium hexacarbonyl, dimanganese decacarbonyl, and [C5H5Fe (CO),], gave no isolable complexes with R2Si(C=CPh)2 80). 

Manganese pentacarbonyl is a free radical and spontaneously dimerizes to dimanganese decacarbonyl. Iron pentacarbonyl is a weak Lewis base and can be protonated by sulfuric acid, forming a metal-hydrogen bond. We will make extensive use of the isolobal... 

To a 250-mL, one-necked, round-bottomed (rb) flask containing a stirring bar are added dimanganese decacarbonyl (1.949 g, 5.000 mmol), 1,2-bis-(diphenylphosphino)ethane (dppe)t (recrystallized once from benzene) (4.003 g, 10.050 mmol), and 75 mL of l-pentanol. ... 

Fig. 75.6 Alternative structures for dimanganese decacarbonyl and dicobalt octacaiboryl. Structure (a) is unknown, but there is infrared evidence for the existence of (b) in solution.

Diketimininates, for cobalt(II) complexes, 7, 16 /3-Diketonates, liquid crystals, 12, 238 Diketones, asymmetric hydrogenation, 10, 48 a-Diketones, bis-silylation, 10, 746 l,l -Dilithioruthenocene, preparation, 6, 630 Dimanganese decacarbonyl complexes, characteristics, 5, 761... 

The ion pair pentacarbonylmanganate(—I) and hexacarbonylmangan-ese(I) reacts on mixing (<5 minutes in THF solutions to afford dimanganese decacarbonyl as the sole carbonyl product (67). Essentially the same results are obtained in THF solution with the acetonitrile and pyridine... 

Dimanganese Decacarbonyl. This reaction should be described first, since no replacement of carbonyl groups is involved. When solutions of dimanganese decacarbonyl and of dinitrogen tetroxide in light petroleum at 0° C. are mixed, the solution becomes deep orange. Within 30 minutes precipitation begins, and... 

To obtain further evidence for the reaction scheme outlined above, the reaction has been carried out in the gas phase (7). Dimanganese decacarbonyl vapor and dinitrogen tetroxide were mixed at 60° C. A smoke was formed immediately the gases came into contact, which settled to a very pale yellow powder. This was the nitro compound, Mn(C0)5N02, containing only a trace of the nitrate, which may well have been formed by oxidation of the nitro compound under these conditions. The increased yield of Mn(C0)5N02 in the gas as compared with the liquid state is consistent with the free-radical interpretation, since heterolytic dissociation of the tetroxide is no longer possible. 

Transient absorption measurements on dimanganese decacarbonyl, (CO)jMn-Mn(CO)5, which undergoes CO ligand loss or metal-metal (M-M) bond cleavage in methanol were also reported [94]. Oscillations in the excited-state absorption suggested that the projection of the reactive potential along the M-M stretch coordinate may be weakly bound (similar... 

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