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Advances in Organometallic Chemistry, Vol. 48 - download pdf or read online

By Robert West, Anthony F. Hill

ISBN-10: 0120311488

ISBN-13: 9780120311484

Just about all branches of chemistry and fabric technological know-how now interface with organometallic chemistry-the research of compounds containing carbon-metal bonds. Organometallic compounds variety from species that are so reactive that they simply have a temporary life at ambient temperatures to species that are thermally very reliable. This generally acclaimed serial comprises authoritative studies that tackle all features of organometallic chemistry, a box which has increased significantly because the booklet of quantity 1 in 1964.

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Example text

The dependence of catalytic activity on the nature of the nitrogen substituent of the NHC demonstrates the influence of the NHC ligand in the catalytic cycle. The best results for ketone hydrosilylation were achieved with 1,3-diphenylimidazolidin-2-ylidene. Asymmetric hydrosilylation is especially interesting for substrates that cannot be reduced with H2 in high enantiomeric excess. The usefulness of chiral C2-symmetric easy-to-prepare imidazolin-2-ylidenes for the transfer of optical information in catalytic reactions 49 Metal Complexes of Stable Carbenes could be shown by the hydrosilylation of acetophenone with diphenylsilane.

T. - 2 AgBr - 2 CH3CN R N PdCl2 N R 2 (33) 28 HERRMANN et al. 64 d. Rare examples. 233,234 The electrochemical oxidation of chromium(0), molybdenum(0), and tungsten(0) NHC complexes is possible. 235,236 The oxidative addition of a suitable substrate equals a two-electron oxidation. , [(L)AuCl] (L = Me2 S, PPh3 tetrahydrothiophene) and subsequently be quenched by HCl to give a 3-hydroimidazolin-2-ylidene complex [Eq. 242–244 Depending on the reactants and the conditions, mono- and bis(NHC) complexes can be formed.

210 Fe(CO)5 + R R R N N ∆ N N - CO N 1/ 2 N Fe(CO)4 R R R (30) A special type of reaction is observed with the platinum(IV) complex [PtI(Me)3] which cleaves the N,N,N′ ,N′ -tetraphenyltetraaminoethylene under reduction to form the dimeric cyclometallated mono(NHC) complex of platinum(II) iodide [Eq. (31)]. 190 Ph Ph N N N N 1/ 2 I {PtI(Me)3}4 2 Ph Ph - 2 CH4 - C 2 H6 N Pt 2 N (31) 26 HERRMANN et al. Benzimidazolin-2-ylidene complexes are conveniently prepared from the corresponding enetetramines.

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Advances in Organometallic Chemistry, Vol. 48 by Robert West, Anthony F. Hill

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