3,3-Dimethyl-2-benzofuran-1(3H)-one.

In the title compound, C(10)H(10)O(2), all the non-H atoms except the methyl C atoms lie on a crystallographic mirror plane. In the crystal, C-H⋯O hydrogen bonds link the mol-ecules into zigzag chains running parallel to [100]. Weak π-π stacking inter-actions between the benzene rings [centroid-centroid distance = 3.9817 (5) Å] link the chains in the [010] direction.