Abstract

Dicarbonyl(η5-cyclopentadienyl)carbyne complexes of molybdenum and tungsten prove to be a valuable synthetic tool: Reaction with phosphines provides substituted carbyne complexes and leads via an intramolecular CC-coupling to η1-or η2-ketenyl complexes respectively. Electrophiles attack the metal carbyne triple bond forming hetero-and acyclic carbene complexes, η2-acyl compounds, η3-ketene complexes and metalla-dithia-bicyclobutane cations. Dithio-carboxylates are formed in reaction of these dicarbonyl(η5-cyclo-pentadienyl)carbyne complexes with sulfur or cyclohexene sulfide.

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