2,3-Diphosphino-1,4-diphosphonium ions |
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Authors: | Carpenter Yuen-ying Dyker C Adam Burford Neil Lumsden Michael D Decken Andreas |
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Institution: | Department of Chemistry, Dalhousie University, Halifax, NS, B3H 4J3, Canada. |
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Abstract: | Salts of the first crystallographically characterized chlorophosphinophosphonium ions have been prepared, and their reaction with Ph3P results in reductive coupling of the chlorophosphine centers to give the first acyclic 2,3-diphosphino-1,4-diphosphonium ions, representing a key framework in the development of catena-phosphorus chemistry. These new salts of general formula R3P-PR'-PR'-PR3]OTf]2 are also obtained in a one-pot diastereoselective reaction of a dichlorophosphine, a tertiary phosphine, and trimethylsilyltrifluoromethanesulfonate. The structural and spectroscopic features of the new dications complement those of the known diphosphonium and 2-phosphino-1,3-diphosphonium dications. Quantitative ligand exchange reactions are observed when derivatives of Ph3P-PR'-PR'-PPh3]OTf]2 are combined with Me3P, demonstrating the coordinative nature of the phosphine-phosphonium P-P bonds and implicating a bonding model involving the diphosphenium dication acceptor. The observed solid state structures have been interpreted in the context of computational studies. |
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