Auriferous alkynylselenolatoalkylidynes.

The reaction of alkynylselenolatoalkylidynes [W([triple bond, length as m-dash]CSeC[triple bond, length as m-dash]CR)(CO)2(Tp*)] (R = SiMe3, SiiPr3, Ph, p-tolyl, tBu, CPh3, SiPh3, GePh3; Tp* = hydrotris(3,5-dimethylpyrazol-1-yl)borate) with [AuCl(L)] (L = tetrahydrothiophene, SMe2) readily furnishes heterobimetallic complexes [WAu(μ-CSeC[triple bond, length as m-dash]CR)Cl(CO)2(Tp*)] where gold(i) chloride coordinates to the tungsten-carbon multiple bond. Alternatively, desilylation of the SiMe3 complex [W([triple bond, length as m-dash]CSeC[triple bond, length as m-dash]CSiMe3)(CO)2(Tp*)] in the presence of gold phosphine complexes [AuCl(PR'3)] (R' = Ph or Cy) furnishes the gold alkynyl derivatives, [W([triple bond, length as m-dash]CSeC[triple bond, length as m-dash]CAuPR'3)(CO)2(Tp*)].