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

The Pd(0)/Cu(I)-catalyzed reactions between Co(mu(3)-CBr)(CO)(9) and W(C&3bond; CC&3bond; CH)(CO)(3)Cp gives the C-5 complex {CP(OC)(3)W}-C&3bond; CC&3bond; CC{Co-3(CO)(9)} (2). Similarly, Co-3(mu 3-CBr)(mu-dppm)(CO)(7) and W(C&3bond; CC&3bond; C)(CO)(3)Cp or Ru(C&3bond; CC&3bond; CH)(dppe)Cp* give {Cp(OC)(3)W}C&3bond; CC&3bond; CC{Co-3(mu-dPPM)(CO)(7)} and {Cp*(dppe)Ru}C&3bond; CC&3bond; CC{Co-3(mu-dppmn)(CO)(7)} (5). An attempt to prepare a C-3 analogue from Ru(C&3bond; CH)(PPh3)(2)Cp and Co-3(mu(3)-CBr)(CO)(9) gave instead the acyl derivative {Cp(PhP)(2)Ru}C7&3bond; CC(O)-C{Co-3(CO)(8)(PPh3)} (7). The X-ray structures of 2, 5 and 7 are reported: the C-5 chains in 2 and 5 have an essentially unperturbed -C&3bond; C-C&3bond; C-C&3bond; formulation. (c) 2005 Elsevier B.V. All rights reserved.