Abstract
Dicarbonyl(n5-cyclopentadienyl) carbyne complexes of molybdenum and tungsten (Fischer 1976, Kreißl 1979) react with an equimolar amount of strong bases such as phosphines via an intramolecular carbon-carbon coupling to yield n2 ketenyl complexes (Kreißl 1977, 1979) and trimethylphosphine-substituted carbyne complexes. The n2-ketenyl compounds can be isolated as stable, deeply colored crystals
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