Carbon–chalcogen wires: alkynyltellurolatocarbynes

Abstract

The reactions of [W(CBr)(CO)₂(Tp*)] (Tp* = tris(dimethylpyrazolyl)borate) with LiTeCCR (R = SiMe₃, SiⁱPr₃, ⁱPr, ⁿBu, ^tBu, Ph, C₆H₄Me-4, methylimidazol-2-yl) afford the first alkynyltellurolatocarbynes [W(CTeCCR)(CO)₂(Tp*)]. Both the WC and CC multiple bonds are prone to metal addition as exemplified by treatment with [MCl(SMe₂)] (M = Cu, Au) to afford the hexametallic complex [W₂Cu₄(μ-CTeCCSiⁱPr₃)₂Cl₄(CO)₄(Tp*)₂] and [WAu(μ-CTeCCSiMe₃)Cl(CO)₂-(Tp*)] which evolves to the unusual hypervalent [WAu(μ-CTeCl₄)(SMe₂)(CO)₂(Tp*)].