Crystal structure of 2-ethyl-3-(4-fluoro­phenyl­sulfin­yl)-5,7-dimethyl-1-benzo­furan

In the title compound, C18H17FO2S, the dihedral angle between the planes of the benzo-furan ring system (r.m.s. deviation = 0.004 Å) and the 4-fluoro-phenyl ring is 86.38 (6)°. The terminal C atom of the ethyl substituent is displaced by 1.444 (3) Å from the benzo-furan ring system to the same side of the mol-ecule as the 4-fluoro-phenyl ring. In the crystal, mol-ecules are linked via pairs of C-H⋯π inter-actions into inversion-related dimers. These dimers are further linked by π-π inter-actions between the benzene rings of neighbouring mol-ecules [centroid-centroid distance = 3.715 (3) Å] and between the furan rings of neighbouring mol-ecules [centroid-centroid distance = 3.598 (3) Å]. The mol-ecules are stacked along the a-axis direction. In the sulfinyl group, the S and O atoms are disordered over two sets of sites, with site-occupancy factors of 0.797 (3) and 0.213 (3).