Reactive organometallic compounds from metallocenes
作者:K. Jonas
DOI:10.1351/pac198456010063
日期:1984.1.1
be covered include the synthesis of (C5H5)Co(C2H4)2 and its application as a catalyst precursor for the cobalt-catalysed alkyne cyclooligarrization and the cotrimerization of alkynes and nitriles. Also reported are the alkali metal cobaltates MA[Co (C2H4)4] and MA[Co (cod)2] (MA = alkali metal) which can be used as starting materials for the preparation of new catalysts for the hydrogenation of olefins
Preparation, Structure, and Reactivity of Nonstabilized Organoiron Compounds. Implications for Iron-Catalyzed Cross Coupling Reactions
作者:Alois Fürstner、Rubén Martin、Helga Krause、Günter Seidel、Richard Goddard、Christian W. Lehmann
DOI:10.1021/ja801466t
日期:2008.7.1
elimination reduce FeX n ( n = 2, 3) to clusters of the formal composition [Fe(MgX) 2] n . The behavior of these intermetallic species can be emulated by structurally well-defined lithium ferrate complexes of the type [Fe(C 2H 4) 4][Li(tmeda)] 2 ( 8), [Fe(cod) 2][Li(dme)] 2 ( 9), [CpFe(C 2H 4) 2][Li(tmeda)] ( 7), [CpFe(cod)][Li(dme)] ( 11), or [Cp*Fe(C 2H 4) 2][Li(tmeda)] ( 14). Such electron-rich
Garcia, Maria P.; Green, Michael; Stone, F. Gordon A., Journal of the Chemical Society, Dalton Transactions
作者:Garcia, Maria P.、Green, Michael、Stone, F. Gordon A.、Somerville, Richard G.、Welch, Alan J.、et al.
DOI:——
日期:——
Triple-decker complexes. 8. Triple-decker sandwiches. Syntheses, reactivity, electrochemistry, and x-ray crystal and electronic structures of bis(cyclopentadienylmetal)-.mu.-1,3-diborolenyl complexes with 29-34 valence electrons
作者:Joseph Edwin、Manfred Bochmann、Michael C. Boehm、David E. Brennan、William E. Geiger、Carl Krueger、Juergen Pebler、Hans Pritzkow、Walter Siebert
DOI:10.1021/ja00347a013
日期:1983.5
Mechanistic Aspects of the Reaction of Anionic Iron(0)-Olefin Complexes with Organic Halides. Detection and Characterization of Paramagnetic Organometallic Intermediates
作者:Dale H. Hill、Masood A. Parvez、Ayusman Sen
DOI:10.1021/ja00086a022
日期:1994.4
The scope and the mechanism of the reactions of [CpFe(COD)][Li(TMEDA) (Cp = C5H5-; COD = 1,5-cyclooctadiene; TMEDA = Me(2)NCH(2)CH(2)NMe(2)), 1, with a number of organic monohalides and geminal dihalides were investigated. With monohalides organic coupling products were observed, and, in:particular, the coupling and cross-coupling of benzyl and allyl halides were studied in detail. The addition of 1 equiv of benzyl halide to 1 in benzene resulted in the initial formation of [CpFe(COD)(CH(2)Ph)], 7. The predominant pathway involved an initial one-electron transfer from [CpFe(COD)](-) to PhCH(2)X to form PhCH(2)X*(-) and [CpFe(COD)]*. PhCH(2)X*(-) quickly disproportionated to form PhCH(2)* and X(-). The benzyl radical then added to [CpFe(COD)]*. Once formed [CpFe(COD)(CH(2)Ph)] reacted with TMEDA in a disproportionation reaction to form 0.5 equiv of the paramagnetic compound, [(TMEDA)Fe(CH(2)Ph)(2)], 3, and 0.5 equiv of FeCp(2). When additional benzyl (or allyl) halide was added, it reacted with [(TMEDA)Fe(CH(2)Ph)(2)] to form the coupled (or cross-coupled) product. This coupling reaction involved the intermediacy of benzyl (and allyl) radicals, and the experimental results were consistent with the product being formed by the coupling of two radicals in solution.