Bis(silylenyl)‐ and Bis(germylenyl)‐Substituted Ferrocenes: Synthesis, Structure, and Catalytic Applications of Bidentate Silicon(II)–Cobalt Complexes

An Isolable Bis(Silanone–Borane) Adduct

“…The reaction of the ferrocene‐derived bis(silylene) 1 with two molar equivalents of triphenylborane in toluene at room temperature leads to the formation of the bis(silylene‐borane) adduct 2 which was isolated in 74 % yields as a red crystalline solid (Scheme ). The identity of 2 was proven by elemental analysis, single‐crystal X‐ray diffraction analysis and multinuclear NMR spectroscopy in the solid state and in solution.…”

Redox‐Active N‐Heterocyclic Germylenes and Stannylenes with a Ferrocene‐1,1′‐diyl Backbone

“…The only other ferrocene‐derived stannylenes known to date are [Sn(Fc N ) 2 ] (Fc N =(2‐dimethylaminomethyl)ferrocenyl) and [fc{SnC 6 H 2 ‐4‐ t Bu‐2,6‐[P(O)(O i Pr) 2 ] 2 } 2 ]; however, these compounds are diorganostannylenes that contain a four‐coordinate tin(II) centre due to chelation by the NMe 2 and P(O)(O i Pr) 2 groups, respectively . In the same context, we note that the only ferrocene‐derived germylene known to date is [fc{Ge[PhC(N t Bu) 2 ]} 2 ], which contains tricoordinate germanium(II) centres due to the chelating amidinato units …”

Isolation and Structure of Germylene‐Germyliumylidenes Stabilized by N‐Heterocyclic Imines

“…In fact, highly charged dicationic germanium(II) complexes require strong donor ligands and al arge coordination number of the metal for isolation. [7,8] In fact, some of the reported bis(germylene)metal complexes showed pronounced catalytic activity for C À Ccoupling [8d] or hydroboration. [5,6] In addition, the use of bis(germylene) as ac helating ligand towards transition metals [7] contributed to the development of this field.…”