1-(2-Meth­oxy­phen­yl)-1H-pyrrole-2,5-dione

In the title compound, C₁₁H₉NO₃, the dihedral angle between the meth­oxy­benzene and 1H-pyrrole-2,5-dione rings is 75.60 (10)°. The C atom of the meth­oxy group is close to coplanar with its attached ring [deviation = 0.208 (2) Å]. In the crystal, weak aromatic π–π stacking [centroid–centroid separation = 3.8563 (13) Å] occurs between inversion-related pairs of benzene rings.

2-(2-Meth­oxy­phen­yl)-1H-isoindole-1,3(2H)-dione

In the title compound, C₁₅H₁₁NO₃, the dihedral angle between the meth­oxy­benzene and isoindole ring systems is 70.21 (3)°. The meth­oxy C atom is close to being coplanar with its attached ring [deviation = 0.133 (2) Å] and is oriented away from the isoindole moiety. In the crystal, inversion dimers linked by pairs of C—H...O hydrogen bonds generate R₂²(10) loops. Further C—H...O inter­actions lead to (010) infinite sheets and weak aromatic π–π stacking [centroid–centroid separations = 3.6990 (10) and 3.7217 (10) Å] is also observed.