Further chemistry of ruthenium butatrienylidene complexes

Crystallographically characterised complexes Ru{CCC(O)Me}(dppe)Cp* (3), [Ru{CCC(NH2)Me}(dppe)Cp*]PF6 (4), [{Ru(dppe)Cp*}2{μ-CCC(OMe)CHCMeCC}]PF6 (5), and the bis(ethynyl)cyclobutenylidene [{Ru(dppe)Cp*}2{μ-CCC4H2 (SiMe3)CC}]PF6 (6) have been obtained from the putative butatrienylidene intermediate [Ru(CCCCH2)(dppe)Cp*]+.