Alkynyl bonding modes

In addition to the well-known luminescent Re(NAN)(GO)3 moieties, the electrochemically active ferrocenyl groups were employed as building blocks for the construction of polynuclear silver(i) alkynyl complexes. Yip reported the synthesis, structural characterization, and electrochemistry of a tetranuclear complex, [Ag3(dppm)3(C=CFc)(OTf)]OTf 96 (Figure 43), with the Ag3(dppm)3 skeletal unit being capped by a ferrocenylethynyl ligand on one side and an OTP anion on the other, all in a /Z3-771-bonding mode.170... 

Zheng, W. J. Roesky, H. W. Alkynyl aluminium compounds bonding modes and stmctures. Dalton Trans. 2002, 2787—2796. 

Organometallic alkynyl complexes exhibit a rich coordination chemistry with copper(l), silver(I), and gold(I) irms, and the ability of alkynyl groups to coordinate to metal centers in a- and Jt-bonding modes has made them versatile ligands in the... 

Alkynyl complexes of copper(i) and silver(i) are usually characterized by their high nudearity, and unusual and numerous bonding modes (Scheme 10.23). 

Scheme 10.23. Examples of bonding modes exhibited by copper(l) and silver(i) alkynyl complexes.

The reactions of / -ketoethynyl- and ) -amidoethynyl(phenyl)iodonium triflates, 17 and 18, with sodium / -toluenesulfinate illustrate the synthetic potential of alkynyliodonium salts33. Although the direct attachment of a carbonyl group to the / -carbon atom of the triple bond in alkynyliodonium ions might be expected to facilitate alkynyl sulfone formation via the Ad-E mechanism, this mode of reactivity has not been observed. Instead, the MC pathway with carbenic insertion dominates and affords sulfones containing the... 

---