Bis(metallaethynyl) ketones: Synthesis and structure of {(Ph(3)P)AuC C}(2)CO and attempted transmetalation: Formation and structure of [1,3-{Ru(dppe)Cp}(2){c-COC(OMe)CHCCH}]PF(6)

Abstract

The bis(metallaethynyl) ketone {(Ph3P)AuC≡C}2CO (1), obtained from (Me3SiC≡C)2CO, AuCl(PPh 3), and NaOMe, forms an Au•••Au-bonded dimer in the solid state (Au•••Au = 2.9825(3) Å). The ES-MS contains ions [2M + X]+ (X = Na, K, Au), but the lack of the ion [2M] + and NMR evidence suggest that the dimeric structure is not preserved in solution. Compound 1 reacts with RuCl(dppe)Cp to afford the unusual dimetal-substituted pyrylium complex [1,3-{Ru(dppe)Cp}2{c-COC(OMe) CHCCH}]PF6 (2). The molecular structure of 2 is also reported, together with a proposed route for its formation. © 2011 American Chemical Society.