By Robert West, Anthony F. Hill
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 diversity from species that are so reactive that they simply have a brief life at ambient temperatures to species that are thermally very good. This extensively acclaimed serial includes authoritative studies that deal with all elements of organometallic chemistry, a box which has accelerated greatly because the book of quantity 1 in 1964.
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Extra info for Advances in Organometallic Chemistry, Vol. 48
Generally, the main purpose of their application was to prove fundamental principles. Low and medium oxidation states like 0, +I, +II, and +III seem to be stabilized best by NHCs. Difﬁculties in preparing and isolating the desired compounds occur with higher and lower oxidation states, although extreme cases such as complexes of rhenium(VII) are known. In summary, almost every transition metal has been used to prepare NHC complexes by one of the routes described previously. C. , in homogeneous catalysis, since the profound understanding of these properties certainly helped in predicting their behavior in these applications.
This is in agreement with the single-bond character of the metal–carbon bond. 155,158,265 In 13C-NMR spectra, the signals for the carbene carbon are usually shifted upﬁeld by about 20–30 ppm upon complexation of the free NHC to a transition metal. 267,268 He I and He II photoelectron spectra of platinum(0)- and palladium(0) bis(imidazolin-2-ylidene) Metal Complexes of Stable Carbenes R R R R R N N R R N N R 35 MLn MLn SCHEME 9. Generally accepted representations of the metal–carbon bond of metal coordinated NHCs.
362 The triazolium salt precursor was immobilized on a Merrifield resin via a dihydropyran linker and the rhodium(I) catalyst was then prepared in THF/NEt3 from [(μ4-cod)RhCl]2. A chiral triazolium salt gave up to 24% ee and 80% yield for an asymmetric hydrosilylation reaction. Recycling was shown to be possible but leaching was not quantiﬁed. 95 These well-deﬁned complexes were attached to a Wang-resin by etheriﬁcation via a bromoalkyl-substituted nitrogen of the NHC to form 68. High reaction temperatures are necessary for catalyst activity with aryl bromides, but the recycling of the catalyst is possible for many times without signiﬁcant loss of activity.