Structural studies on ruthenium carbonyl hydrides. 17. Tetrametallic alkylidyne clusters: (.mu.-H)Ru4(.mu.4-.eta.2-COMe)(CO)12, (.mu.-H)Ru4(.mu.3-COMe)(CO)9{(PPh2)3CH}, and (.mu.-H)Ru3Fe(.mu.4-.eta.2-CX)(CO)12 (X = OMe, NMe2). Crystal structures of (.mu.-H)Ru4(.mu.4-.eta.2-COMe)(CO)12 and (.mu.-H)Ru3Fe(.mu.4-.eta.2-COMe)(CO)12

Aminocarbyne ligands in organometallic chemistry

“…This is exemplified in Scheme 49a, where the nuclearity of the diiron complex 40j is increased by reaction with [Fe2Cp2(CO)4] via a reduction/UV irradiation sequence, to give 115 in 5% yield. Pyrolysis of 62c, either in the presence of M(CO)5 (M = Fe, Ru) or not, provides mixtures of higher nuclearity products (Ru3Fe, Ru4, Ru5, Ru6, Ru7), some of them featuring a tetracoordinated μ4:η 2 -aminocarbyne ligand (116, Scheme 49b) [254,255,256]. In the X-ray structure of 116 (Figure 20), the {CNR2} fragment is lying in the fold of a M4 butterfly unit.…”