Some complexes containing carbon chains end-capped with tungsten or ruthenium groups and tricobalt carbonyl clusters

The Pd(0)/Cu(I)-catalysed reactions between Co3(μ3-CBr)(CO)7(LL) [LL = (CO)2, μ-dppm] and HCCCC[MLn] [MLn = W(CO)3Cp or Ru(dppe)Cp*] give the C5 complexes {LnM}CCCCC{Co3(CO)9}. An attempt to prepare a C3 analogue from Ru(CCH)(PPh3)2Cp and Co3(μ3-CBr)(CO)9 gave instead the acyl derivative {Cp(Ph3P)2Ru}CCC(O)C{Co3(CO)8 PPh3}.