Homoleptic transition metal acetylides

trans Bis-N-heterocyclic carbene bis-acetylide palladium(II) complexes

“…One isopropyl group is disordered over two sets of positions with siteoccupancy factors of 0.425(11) and 0.575 (11). In the crystal structure of 4, one alkyne ligand C^CeSiMe 3 is disordered over two sets of positions with site-occupancy factors of 0.748(4) and 0.252 (4). Some restraints had to be used to correct the geometry and thermal parameters of the minor occupancy component and its corresponding atoms.…”

Formal Gold‐to‐Gold Transmetalation of an Alkynyl Group Mediated by Palladium: A Bisalkynyl Gold Complex as a Ligand to Palladium

“…[25,26] As for palladium allyl fragments bound to two metal alkynyls, only a few examples of platinum alkynyls acting as ligands have been reported. [22] The formation of 3 in Scheme 1 involves an effective rearrangement of ligands and organometallic fragments.…”

Alkynyl Ti–M complexes based on M(CO)4 and MO2 building blocks (M = Mo, W)

“…The X-ray diffraction study reveals the formation of an unsymmetric doubly alkynyl-bridged structure (Fig. 1), although 5 possesses crystallographically imposed C s symmetry, and displays that the two trimethylsilylethynyl groups 3,19,20,27] (3) Å) indicate relatively strong alkyne-to-metal interactions [28]. This shows that the formation of 5 is associated by a formal oxidative addition of a Ti(IV)eC bond to a Mo(0) atom leading to a formally heterobimetallic Ti(III)eMo(I) system.…”

“…For instance, in {[Ti](m-h 1 :h 2 -C^CFc) 2 }Pt(PPh 3 ) (Fc ¼ Fe(h 5 -C 5 H 5 )(h 5 -C 5 H 4 )) the ferrocenyl moieties are oriented below the [Ti](C^CFc) 2 Pt plane with the PPh 3 ligand lying above, as a result of steric constraints [17]. Alkynyl migration is observed in {[Ti](C^CSiMe 3 ) 2 }M(PPh 3 ) (M ¼ Ni, Pt) complexes due to the steric interaction between the bulky groups M(PPh 3 ) and Me 3 Si, thus forming type E molecules [2f, 15,18,19]. Compounds 5e8 represent one of the few samples of heterobimetallic doubly alkynyl-bridged transition metal species [2,3], featuring a group-IV and a group VI metal atom.…”