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The structure of the title compound, C 11 H 7 NO 2 , is isotypic to that of its homologue, 1-octylindoline-2,3-dione [Qachchachi  et al.  (2013  ▶ ).  Acta Cryst.  E 69 , o1801]. The indoline ring and the two carbonyl O atoms are approximately coplanar, the largest deviation from the mean plane being 0.021 (1) Å for one of the O atoms. The mean plane through the fused ring system is nearly perpendicular to the propynyl group, as indicated by the N—C—C—C torsion angle of 77.9 (1)°. In the crystal, molecules are linked by C—H⋯O hydrogen bonds and π–π interactions between benzene rings [intercentroid distance = 3.5630 (10) Å], forming a three-dimensional structure.

1-(Prop-2-ynyl)indoline-2,3-dione