Transition metal complexes carbenes

Keywords Azolium salts AJ-heterocydic carbenes transition metal complexes asymmetric catalysis... 

Since there are many more carbene-transition-metal complexes known than main-group adducts this chapter is organized by the synthetic methods that lead to the complexes rather than by the metal itself, Applications of these complexes to catalysis and materials science will be discussed in separate chapters of this article. 

Stable Carbene-Transition Metal Complexes Applications in Catalysis.. . 358... 

Compounds with multiple bonds between a transition metal and group-14 elements as the heavier analogues of carbenes — transition metal complexes of the type (CO)sCr-EH2 (E = C to Sn) — have been calculated at the DFT level by Jacobsen and Ziegler117. The authors report the equilibrium geometries and the transition metal-E bond dissociation... 

Sanderson MD, Kamplain JW, Bielawski CW (2006) Quinone-annulated N-heterocyclic carbene-transition-metal complexes observation of jt-back-bonding using FT-IR spectroscopy and cyclic voltammetry. J Am Chem Soc 128 16514-16515... 

Lappert MF, Maskell RK. (1984) Carbene transition metal complexes as hydrosilylation... 

Figure 1.1 Bonding in Fischer, Wanziick-Arduengo and Schrock carbene transition metal complexes.

Note The formation of bridging versus chelating bis-carbene transition metal complexes is a function of tether length, reaction temperature, steric demand of wingtip groups and the order of the addition of counter anions. 

Figure 3.121 Synthesis of Janus (back-to-back) bis-carbene transition metal complexes.

N-HeterocycHc carbene transition metal complexes for catalysis in aqueous media 12CSR7032. 

---