Bis{[3-(diphenylphosphino)propyl]trimethylphosphonium-P}[(2,3,5,6-η)-norbornadiene]rhodium(I) Tris(tetrafluoroborate)

The title complex, [Rh(C₁₈H₂₅P₂)₂(C₇H₈)](BF₄)₃, is representative of a family of excellent biphasic olefin hydrogenation catalysts. The cation exhibits an essentially square-planar geometry around the Rh^I ion, with the two PPh₂ groups and the two norbornadiene C=C double bonds forming the inner coordination sphere; Rh—P 2.3082 (11) and 2.3332 (12), and Rh—C 2.180 (5)–2.204 (5) Å.

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