Structure Reports Online

Volume 65, Part 5 (May 2009)

organic compounds

Acta Cryst. (2009). E65, o1080 [ doi:10.1107/S1600536809013488 ]

Tris[3,5-bis(trifluoromethyl)phenyl]phosphine oxide

O. bin Shawkataly, M. A. A. Pankhi, M. I. Mohamed-Ibrahim, M. R. Hamdan and H.-K. Fun

Abstract: In the title compound, C₂₄H₉F₁₈OP, an intramolecular C-HO short contact generates a five-membered ring, producing an S(5) ring motif. The dihedral angles between the benzene rings are 57.68 (10), 77.80 (11) and 79.48 (10)°. Each of the six trifluoromethyl substituents shows rotational disorder over two positions with refined site-occupany ratios of 0.64 (3)/0.36 (3), 0.649 (14)/0.351 (14), 0.52 (2)/0.48 (2), 0.545 (16)/0.455 (16), 0.774 (9)/0.226 (9) and 0.63 (5)/0.37 (5). The crystal structure is stabilized by intermolecular C-HO and C-HF interactions.