1-Diphenylphosphino-2-phenyl-1,2-dicarba-closo-dodecaborane(12)

The two crystallographically independent molecules of the title compound, 1-[(C₆H₅)₂P]-2-C₆H₅-1,2-C₂B₁₀H₁₀(C₂₀H₂₅B₁₀P), in the asymmetric fraction of the unit cell are highly congruent. The conformation of the cage phenyl groups is defined by θ = 1.15° and the average C1—C2 distance is 1.744 (8) Å, which is significantly longer than usual for 1,2-C₂B₁₀H₁₀ compounds. The PPh₂ substituent is tilted away from an idealized radial position on C1 as a result of intramolecular crowding.

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