Production of bisphosphines

Chemistry of inorganic compounds – Phosphorus or compound thereof

Reexamination Certificate

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Reexamination Certificate

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07914759

ABSTRACT:
Bisphosphines are prepared by reacting a phosphine with a dihalide in the presence of an acid; characteristically, bisphosphonium compounds are initially formed and then converted into the bisphosphines.

REFERENCES:
patent: 7135582 (2006-11-01), Goto et al.
patent: 1 452 537 (2004-09-01), None
patent: WO 2005/023823 (2005-03-01), None
Porchia et al., {New Approach to the Chemistry of Technetium(V) and Rhenium(V) Phenylimido Complexes: Novel [M(NPh)PNP]3+ Metal Fragments (M=Tc, Re; PNP=Aminodiphosphine) Suitable for the Synthesis of Stable Mixed-Ligand Compounds, Inorganic Chemistry (2005), 44(13), 4766-4776}.
Dani et al., {Complexes of Bis-ortho-cyclometalated Bisphosphinoaryl Ruthenium(II) Cations with Neutral Meta-bisphosphinoarene Ligands Containing an Agostic C-HoooRu Interaction, Organometallics (2000), 19(25), 5287-5296}.
Miura et al., “Synthesis and Reactions of Optically Active Secondary Dialkylphosphine-Boranes”, Journal of Organic Chemistry, Mar. 2, 2000, pp. 1877-1880, vol. 65, No. 6, American Chemical Society.

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