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Dalton Transactions

The international journal for inorganic, organometallic and bioinorganic chemistry



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Dalton Trans., 2009, 8145 - 8154, DOI: 10.1039/b906840f

Ligating properties of anionic Fischer-type carbene complexes, [(CO)5MC(X)Y]-

Helgard G. Raubenheimer, Stephanie Cronje and Christoph E. Strasser

With the simplest of anionic Fischer-type carbene complexes acting as ligands, Cp2Zr(Cl){OCMe}M(CO)5 compounds (M = Cr or W) promote -olefin oligomerization and polymerization in the presence of MAO. Attaching an N-heterocyclic ring to the carbene carbon atom in similar precursors, allows a variety of hard metal ions and fragments to be captured by external bidentate coordination. The outcome of the attachment of a phosphorus or sulfur functionality to an -carbon of an O-anionic carbene is formation of a bidentate ligand and then internal four-membered carbene–heteroatom chelate formation. -Deprotonated carbene complexes are also precursors for remote, one-N, six-membered carbene complexes of various metals whereas -C-, -N- or -O-deprotonated as well as -deprotonated Fischer-type carbene complexes display unique synthon properties towards Ph3PAu+ and partake in unusual ensuing coordination of liberated group 6 metal carbonyl moieties to form dinuclear products.

Graphical abstract image for this article (ID: b906840f)