Preparation, structure and some chemistry of FcC≡CC≡CC≡CRu(dppe)Cp

Abstract

The synthesis of Fc(C{triple bond, long}C)3Ru(dppe)Cp (2) from Fc(C{triple bond, long}C)3SiMe3 and RuCl(dppe)Cp is described, together with its reactions with tcne to give the tetracyano-dienyl FcC{triple bond, long}CC{triple bond, long}C{C[{double bond, long}C(CN)2]}2Ru(dppe)Cp (3) and -cyclobutenyl FcC{triple bond, long}CC{triple bond, long}C{C{double bond, long}CC(CN)2C(CN)2}Ru(dppe)Cp (4), with Co2(μ-dppm)n(CO)8-2n (n = 0, 1) to give FcC2{Co2(CO)6}C2{Co2(CO)6}C{triple bond, long}CRu(dppe)Cp (5) and FcC{triple bond, long}CC{triple bond, long}CC2{Co2(μ-dppm)(CO)4}Ru(dppe)Cp (6), respectively, and with Os3(CO)10(NCMe)2 to give Os3{μ3-C2C{triple bond, long}CC{triple bond, long}C[Ru(dppe)Cp]}(CO)10 (7). On standing in solution, the latter isomerises to the cyclo-metallated derivative Os3(μ-H){μ3-C[Ru(dppe)Cp]CCC[(η-C5H3)FeCp]}(CO)8 (8). X-ray structural determinations of 1, 2, 6 and 7 are reported. © 2007 Elsevier B.V. All rights reserved.