Acetylenes can react with metal complexes in a number of ways. Internal acetylenes usually coordinate to metal centers in a η2-fashion, in which the C㝁C triple bond donates electrons to the metal center, and both carbon atoms form Ru-C bonds. In some cases, another kind of reaction is seen, in which the terminal acetylene rearranges to a vinylidene complex, M㝂C㝂CHR. Closely related to this vinylidene complex is the ruthenium acetylide compound (η5-C5H5)Ru(C㝁CPh)(PPh3)2, which was originally prepared by treatment of the chloro complex (cyclopentadienyl)bis(triphenylphosphine) chlororuthenium(II) ((η5-C5H5)RuCl(PPh3)2) with copper phenylacetylide, CuC㝁CPh. The deprotonation of the monosubstituted vinylidene complexes to the corresponding acetylide complexes proceeds in high yield, and consequently this reaction sequence is the synthetic method used in the following preparation of the acetylide complexes. The chemistry of ruthenium cyclopentadienyl complexes is reviewed in this chapter.
ASJC Scopus subject areas
- Materials Science(all)