Journal of Organometallic Chemistry p. 59 - 62 (1996)
Update date:2022-08-04
Topics:
Lehotkay
Ostermeier
Ogric
Kreissl
η2-Phosphinocarbene complexes of tungsten show a different behaviour towards anionic nucleophiles. The cationic η2-phosphinocarbene complex [Cp(CO)2W=C(Tol)PPh2][BPh4] reacts with the thiophenolate anion PhS- via carbonyl substitution, whereas the corresponding trimethylphosphine substituted carbene complex [Cp(CO)(PMe3)W=C(Tol)PPh2][BF4] adds the cyclopentadienyl anion at the carbene carbon atom. A third reaction pathway is observed on treating [Cp(CO)2W=C(Me)PPh2][BPh4] with lithium diethylamide, providing a neutral η2-phosphinovinyl complex.
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