Reactions of Bis(tricarbido)mercurials and Dimetallaoctatetraynes with [Ru(CO)2(PPh3)3]: Scission of a Csp−Csp Single Bond

The reactions of [L(CO) 2 WC 6 W(CO) 2 L] (L = HB(pz) 3, HB(pz‘) 3; pz = pyrazol-1-yl, pz‘ = dimethylpyrazol-1-yl) with [Ru(CO) 2 (PPh 3 ) 3 ] provide the bis(tricarbido) complexes [(Ph 3 P) 2 (CO) 2 Ru{C 3 W(CO) 2 L} 2 ] via the adduct [(Ph 3 P) 2 (CO) 2 Ru{η 2 -L(CO) 2 WC 6 W(CO) 2 L}], which, along with [(Ph 3 P) 2 (CO) 2 Ru{C 3 W(CO) 2 L}{HgC 3 W(CO) 2 L}], is observed as an intermediate in the reactions of [Ru(CO) 2 (PPh 3 ) 3 ] with [Hg{C 3 W(CO) 2 L} 2 ] that also ultimately provide the bis(carbido) complex.