By Robert West, Anthony F. Hill
Just about all branches of chemistry and fabric technology now interface with organometallic chemistry-the learn of compounds containing carbon-metal bonds. Organometallic compounds diversity from species that are so reactive that they simply have a temporary lifestyles at ambient temperatures to species that are thermally very sturdy. This commonly acclaimed serial comprises authoritative reports that deal with all features of organometallic chemistry, a box which has multiplied greatly because the e-book of quantity 1 in 1964.
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Extra resources for Advances in Organometallic Chemistry, Vol. 48
Alkyne Dimerization The 16-electron ruthenium(II) complexes [(η5-C5Me5)Ru(NHC)Cl] with sterically demanding NHCs catalyze the carbon–carbon coupling of terminal alkynes HC CR (R = Ph, SiMe3, tBu, p-Tol) under mild conditions. 115 D. Heterogenization The difﬁcult recycling of catalysts from the reaction mixture represents a major drawback of homogeneous systems compared to heterogeneous catalysts. 354,355,361 One of them is the immobilization of homogeneous catalysts on a solid support via an organic linker.
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. 264 A barrier of rotation due to a double-bond character of the metal–NHC bond could not be determined so far. 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.
Heck-Type Reactions Other successful examples of catalysts containing NHC ligands are found in palladium- and nickel-catalyzed carbon–carbon bond formations. The catalyst development with these metals has focused in particular on Heck-type reactions, especially the Mizoroki–Heck reaction itself [Eq. (42)]315–318 and various cross coupling reactions [Eq. 323–325 Related reactions like the Sonogashira coupling [Eq. (44)]326–329 and the Buchwald– Hartwig amination [Eq. (45)]330–333 were also successfully performed with these types of catalysts.
Advances in Organometallic Chemistry, Vol. 48 by Robert West, Anthony F. Hill