Cyclopentadienylruthenium phosphine complexes. Part II. Reactions between hydridobis(triphenylphosphine)(π-cyclopentadienyl)ruthenium and acetylenes

Abstract

Reaction between RuH(PPh₃)₂(π-C₅H₅) and C₂(CF₃)₂ affords Ru[cis-CF₃C:C(H)(CF₃)](PPh₃)₂(π-C₅H₅)(I) and the butadienyl complex [graphic omitted]CH(CF₃)(PPh₃)(π-C₅H₅)(II). With C₂(CO₂Me)₂ the hydride affords the trans-adduct RuC(CO₂Me):CH(CO₂Me)(PPh₃)₂(π-C₅H₅)(IV), together with the cyclic ester complex [graphic omitted](PPh₃)(π-C₅H₅)(V). Reaction of (IV) or (V) with C₂(CF₃)₂ affords a butadienyl complex [graphic omitted]CH(CF₃)(PPh₃)(π-C₅H₅)(VI). Hexafluoroacetone and (IV) react to give a complex (VII) containing a co-ordinated ester group and an intramolecular hydrogen bond, formal insertion of the ketone into a C–H bond of the cyclopentadienyl ligand having occurred.