Osmium n

Osmium tetroxide reacts with phenyl Grignard reagent to produce a reactive intermediate, serving as a synthetic route to prepare polyphenyl osmium complexes. For example, reaction with o-tolyl magnesium bromide, o-tolMgBr, forms a purple, tetracoordinated osmium ort/io-tolyl complex, Os(o-tol)4, which reacts with trimethylphosphine or carbon monoxide to yield osmium n-aryl complexes. 

Lewis acid treatment of a 2-furanylmethanol complexed to the 7t-base pentaamine osmium(n) in the presence of carbonyl compounds provides a route to 4-substituted dihydropyran-3-ones. However, the design of a protocol for efficient removal of the osmium from the products is in its early stages <2000T2313>. 

Osmium(n).—Group VII Donors. Hydrido- and halogeno-carbonyl complexes. Carbonylation of [OsHX(CO)(PCy3)2] has produced the novel dicarbonyl hydride [OsHX(CO)2(PCy3)2] (X = Cl or Br Cy = tricyclohexyl).17 I.r. and n.m.r. data indicate the geometry (17). Addition of other ligands to the five-co-ordinate... 

Modifications cristallines du trioxy-difluorure d osmium. — N. K. Jha ( ) a montre que OsOaFa se presente sous trois formes cristallines, mais aucune de ces formes n a ete proprement caract risee au point de vue structural. Les etudes de fluoration decrites ici nous ont permis de les mieux caracteriser, deux d entre elles (a et y OsOjFo) 6tant obtenues sous forme de monocristaux. Dans le tableau II, sont indiquees... 

Cl2H,sN30s, Osmium(n), pentaammine(di-nitrogen)-, didiloride, 24 270 Cl2HfC2oH3o, Hafnium, dichlorobis(T -pen-tamethylcyclopentadienyl)-, 24 154 CI2M02N4C8H24, Molybdenum, dichlorotet-raki (dimethylamido)di-, M—Mo), 21 56... 

OS2F24N12P4C58H44 2H2O, Osmium(n), tetra-kis(2,2 -bipyridine)-/j-[2,3-bis(2-pyridyl)-quinoxaUne]-, cis-, di-, hexafluoro-phosphate(l-), dihydrate, 33 33 OS2F24N12P4C62H46 3H2O, Osmium(II), tetra-kis(2,2 -bipyridine)-/j-[2,3-bis(2-pyridyl)-benzoquinoxaUne]-, cis-, di-, hexafluoro-phosphate(l-), trihydrate, 33 34... 

B. DICHLORO(THIOCARBONYL)TRIS(TRIPHENYL-PHOSPHINE)OSMIUM(n)... 

Sekota M, Nyokong T (1997) Catal3dic behavior of osmium(n), ihodium(III) and ruthenium (II) Phthalocyanines towards the electrooxidation of cysteine on glassy carbon electrodes. 

---