3. Soluble Metal Oxides 2459 3.1. Polyoxometalates 2459 3.2. Peroxotungstates 2459 3.3. Peroxomolybdates 2460 3.4. Methyltrioxorhenium 2461 3.5. Other Metal Oxides 2461 4. Metal Oxides Generated in Situ 2461 4.1. Selenium and Arsenic Compounds 2461 4.2. Simple Metal Salts 2462 5. Coordination Complexes 2463 5.1. Manganese Porphyrins 2463 5.2. Iron Porphyrins 2464 5.3. Manganese Salen Complexes 2466 5.4. 1,4,7-Triazacyclononane (TACN) Complexes 2466 5.5. Iron and Manganese Pyridyl-Amine Complexes 2468

/pdf/metal-catalyzed-epoxidations-of-alkenes-with-hydrogen-3kxbglgruw.pdf

Metal-Catalyzed Epoxidations of Alkenes with Hydrogen Peroxide

Bis(imino)pyridines : Surprisingly reactive ligands and a gateway to new families of catalysts

Metallophthalocyanines as catalysts in electrochemical reactions

Reactions of transition metal-coordinated nitriles

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/pdf/metal-assisted-cycloaddition-reactions-in-organotransition-2cf6yzr4gb.pdf

Metal-Assisted Cycloaddition Reactions in Organotransition Metal Chemistry

Reactivity of transition metal hydrides and thiolates. Reaction of trihydridobis(π-cyclopentadienyl)niobium with dimethyldisulphide and reactions of niobium, molybdenum and tungsten thiolates with alkynes

The quadruply metal–metal bonded molybdenum(II) complex [Mo2L2](1)(L = C22H22N42–) reacts with tetracyanoethylene (TCNE) to afford first the biradical compound [(1)+·(TCNE)–·] and then, presumably via reaction with traces of water, the oxo-molybdenum(v) derivative [MoOL][C3(CN)5](2), the structure of which has been determined by X-ray diffraction [Mo–O 1.670(3)A]; reduction of (2) with Na/Hg gives the dinuclear multiply metal–metal bonded radical anion (1)–·.

Ready, reversible conversion of a quadruply metal–metal bonded dinuclear complex into a mononuclear complex

Interconversion of mononuclear and quadruply bonded dinuclear dibenzotetraaza[14]annulene complexes of molybdenum [Erratum to document cited in CA114(12):113946d]

Triperoxovanadates of the type MI[V(O–O)3(AA)],nH2O and MI3[V(O–O)3(AA)′],H2O [M1= NH4, K or Na;(AA)= phen or bipy; (AA)′= C2O4(phen = 1,10-phenanthroline, bipy = 2,2′-bipyridyl)] have been prepared by reaction of the ligands with solutions of metavanadates in hydrogen peroxide. The molar conductivities of these salts in aqueous solution show the presence of 1 : 1 and 3 : 1 electrolytes. The existence, splitting, and shift of some i.r. bands including, in the 550–650 cm–1 region, bands assigned to the [graphic omitted] group show that the peroxophen, bipy and oxalato-groups are co-ordinated as bidentate ligands. U.v. spectra, magnetic susceptibilities, and an X-ray analysis are also reported. These complexes, in which the vanadium is probably eight-co-ordinate, are compared with the corresponding niobium and tantalum derivatives.

Peroxo-complexes: triperoxovanadates(V) complexes

X-Band e.s.r. spectra of two [Nb(η-C5H5)2{S2P(OR)2}]+ complexes (R = C2H5 or i-C3H7) have been recorded at room temperature and 77 K. They show interaction of the unpaired electron with the 93Nb and the 31P nuclei. A detailed analysis of spin-Hamiltonian parameters is given and the bonding is discussed assuming that the ligand field around niobium has C2v symmetry. The strong and almost isotropic superhyperfine coupling of the unpaired electron with the 31P nucleus is interpretable in terms of delocalization through the sulphur atoms.

Jean Sala-Pala

Papers

Reactivity of transition metal hydrides and thiolates. Reaction of trihydridobis(π-cyclopentadienyl)niobium with dimethyldisulphide and reactions of niobium, molybdenum and tungsten thiolates with alkynes

Ready, reversible conversion of a quadruply metal–metal bonded dinuclear complex into a mononuclear complex

Interconversion of mononuclear and quadruply bonded dinuclear dibenzotetraaza[14]annulene complexes of molybdenum [Erratum to document cited in CA114(12):113946d]

Peroxo-complexes: triperoxovanadates(V) complexes

Niobium organometallic chemistry. Part 6. Electron spin resonance study of bonding in pseudo-tetrahedral Bis(η-cyclopentadienyl)niobium(IV) complexes