Carbon-chalcogen wires: alkynyltellurolatocarbynes.

The reactions of [W(CBr)(CO) 2 (Tp*)] (Tp* = tris(dimethylpyrazolyl)borate) with LiTeCCR (R = SiMe 3 , Si i Pr 3 , i Pr, n Bu, t Bu, Ph, C 6 H 4 Me-4, methylimidazol-2-yl) afford the first alkynyltellurolatocarbynes [W(CTeCCR)(CO) 2 (Tp*)]. Both the WC and CC multiple bonds are prone to metal addition as exemplified by treatment with [MCl(SMe 2 )] (M = Cu, Au) to afford the hexametallic complex [W 2 Cu 4 (μ-CTeCCSi i Pr 3 ) 2 Cl 4 (CO) 4 (Tp*) 2 ] and [WAu(μ-CTeCCSiMe 3 )Cl(CO) 2 -(Tp*)] which evolves to the unusual hypervalent [WAu(μ-CTeCl 4 )(SMe 2 )(CO) 2 (Tp*)].