Download e-book for kindle: Advances in Organometallic Chemistry, Vol. 48 by Robert West, Anthony F. Hill

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 examine of compounds containing carbon-metal bonds. Organometallic compounds variety from species that are so reactive that they simply have a brief life at ambient temperatures to species that are thermally very good. This greatly acclaimed serial includes authoritative stories that deal with all elements of organometallic chemistry, a box which has elevated drastically because the book of quantity 1 in 1964.

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The dependence of the ring parameters of the NHC on the coordinated metal follows the general rule that metal–carbon bonds become stronger when going from 3d to 4d and 5d transition metals. This effect results in an increase in the N–C–N angle and a decrease in the N–C bond length. 259 According to this simple model NHCs can be considered as “fences” requiring parameters for their length and height. In contrast to phosphines, two different angles have to be introduced depending on the perspective from which the NHC is viewed.

In most of these transformations, they were not found to be real alternatives to other ligand classes, but it has to be taken into account that only a small number of structurally different stable carbenes have been investigated so far. One of the main problems applying NHCs as ligands in homogeneous catalysis is the fact that these ligands form a metal–carbon bond, which can interfere in the catalytic process. In migratory insertion steps of the desired reaction there is a possible competition of this step with the insertion into the metal–NHC bond.

218 6. Other Methods In addition to the previously mentioned most common methods some less frequently used reactions have also led to NHC complexes. In all these cases certain requirements for the metal, the complex precursor or the NHC itself, have limited the approach and have prevented broader applications. a. Vapor phase synthesis. In the case of sublimable NHCs the vapor deposition method can lead to the formation of desired complexes. 219 b. The metalla-Ugi reaction. The isolobal analogy of oxygen and a d6-transition metal complex fragment ML5 is the idea behind the application of the Ugi-4component condensation for hydantoins in transition metal complex synthesis:220 Anionic cyano complexes are reacted with an aldehyde, an isocyanide, and an ammonium salt to form the desired NHC complexes [Eq.

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

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