3‐[4‐(4‐Fluoro­phenyl)­piperazin‐1‐yl­methyl]‐5‐methyl‐1,3‐benzoxazol‐2(3H)‐one and 3‐[4‐(2‐fluoro­phenyl)­piperazin‐1‐yl­methyl]‐5‐methyl‐1,3‐benzoxazol‐2(3H)‐one

The title compounds, both C₁₉H₂₀FN₃O₂, contain essentially planar benzoxazolinone ring systems, within which the C—N bond distances and angles do not differ significantly between the two compounds. In both cases, the piperazine ring adopts an almost perfect chair conformation and the benzoxazo­l­inone ring system lies nearly perpendicular to it. The structures contain intermolecular C—H⋯O contacts, and the interactions between the benzoxazolinone and fluoro­phenyl­piperazine portions of the mol­ecules are segregated.