1. Early reports on the synthesis of chromium(II), molybdenum(II), and tungsten(II) carbene complexes with a stabilizing aromatic π-donor ligand include: (a) N.A. Bailey, P.L. Chell, A. Mukhopadhyay, H.E. Tabbron, M.J. Winter, J. Chem. Soc. Chem. Commun. (1982) 215;(b) F.R. Kreissl, W.J. Sieber, M. Wolfgruber, J. Organomet. Chem. 270 (1984) C45;(c) J.A.K. Howard, J.C. Jeffery, J.C.V. Laurie, F.G.A. Stone, A. Stringer, Inorg. Chim. Acta 100 (1985) 23;(d) V.A. Osborne, M.J. Winter, J. Chem. Soc. Chem. Commun. (1985) 1744;(e) B. Lungwitz, A.C. Filippou, NATO ASI Ser. Ser. C 392 (1993) 249;(f) A.C. Filippou, D. Wössner, B. Lungwitz, G. Kociok-Köhn, Angew. Chem. 108 (1996) 981; Angew. Chem. Int. Ed. Engl. 35 (1996) 876.
2. Carbene complexes. Part 10. Electron-rich olefin-based mono-, bis-, and tris-carbene-tungsten(0) complexes and some derived six and seven-co-ordinate mono- and bis-carbene-dihalogenotungsten(II) and related molybdenum(II) species
3. Carbene complexes. Part 12. Electron-rich olefin-derived neutral mono- and bis-(carbene) complexes of low-oxidation-state manganese, iron, cobalt, nickel, and ruthenium
4. For a recent review on complexes with cyclic bisaminocarbene ligands see: W.A. Herrmann, C. Köcher, Angew. Chem. 109 (1997) 2256; Angew. Chem. Int. Ed. Engl. 36 (1997) 2162.
5. Multiple metal-carbon bonds. 25. Preparation and structure of tungsten neopentylidene hydride, neopentylidene carbonyl, and neopentylidene ethylene complexes