(E)-1,5-Di-phenyl-pent-2-en-4-yn-1-one.

The title compound, C17H12O, has an E conformation about the C=C bond. The C-C C-C torsion angle is 7.7 (2)°, and the mean planes of the phenyl-ethyl-enone [r.m.s. deviation = 0.059 (1) Å] and phenyl-acetyl-ene [r.m.s. deviation = 0.023 (1) Å] fragments form a dihedral angle of 14.16 (7)°. In the crystal, weak C-H⋯O inter-actions link the mol-ecules into zigzag chains propagated in [010].