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Cyclopropenylylidene-Stabilized Diaryl and Dialkyl Phosphenium Cations: Applications in Homogeneous Gold Catalysis


  • Generous financial support by the Fonds der Chemischen Industrie is gratefully acknowledged. We also thank Prof. A. Fürstner for constant encouragement and support, C. Laurich, Max-Planck-Institut für Bioanorganische Chemie, Mülheim an der Ruhr, for recording the electrochemical data, and the X-ray department of our institute.


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Cationic but electron-rich: Cyclopropenylylidene-stabilized phosphenium cations exhibit the electron richness of classical trialkyl and triaryl phosphines even though they carry a positive charge stemming from a cationic substituent directly bonded to the phosphorous atom. These two facts have been exploited to synthesize gold catalysts that can be easily recycled after use.