3-(4-Bromophenyl)cyclopent-2-en-1-one

In the title compound, C 11 H 9 BrO, the cyclopentenone ring is almost planar with an r.m.s. deviation of 0.0097 Å. The largest inter-ring torsion angles [2.4 (3), 1.3 (3) and 3.53 (2)°] reveal only a very small twist between the rings, and suggest that the two rings are conjugated. The molecule is slightly bowed, as shown by the small dihedral angle between the rings [5.3 (1)°]. The crystal packing pattern consists of parallel sheets that stack parallel to the ac plane. Each sheet consists of molecules that pack side-to-side with the same relative orientation of phenyl and cyclopentenone rings along the a - and c -axis directions. Slipped side-to-side, face-to-face and edge-to-face interactions exist between pairs of sheets with edge-to-edge and edge-to-face O...H—C( sp 2 ) weak hydrogen-bond contacts. A relatively short edge-to-face contact (2.77 Å) also exists between pairs of sheets.

Abstract licence: CC BY

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