cis-4,5-Dihydroxy-2,3,4,5-tetraphenylcyclopent-2-enone

The title compound, C₂₉H₂₂O₃, was prepared from oxidation of tetraphenylcyclopentadienone with tetranitromethane. The cyclopentenone ring has a C5-envelope conformation with an elongated C_sp³—C_sp³ bond length of 1.569 (2) Å. One hydroxyl group takes part in a bifurcated hydrogen bond involving an intra- and intermolecular bond to adjacent hydroxyl groups, O...O 2.6299 (16) and 2.9279 (15) Å], while the second forms an intermolecular hydrogen bond to an adjacent carbonyl O atom [O...O 2.8441 (18) Å].

-1