7-Meth­oxy­indan-1-one

In the title compound, C₁₀H₁₀O₂, the 1-indanone unit is essentially planar (r.m.s. deviation = 0.028 Å). In the crystal, molecules are linked via C—H...O hydrogen bonds, forming layers lying parallel to the ab plane. This two-dimensional structure is stabilized by a weak C—H...π inter­action. A second weak C—H...π inter­action links the layers, forming a three-dimensional structure.

3-Oxo-2,3-dihydro-1H-inden-4-yl acetate

In the title compound, C₁₁H₁₀O₃, the 1-indanone unit is essentially planar (r.m.s. deviation = 0.036 Å). In the crystal, mol­ecules are linked by non-classical C—H...O hydrogen bonds, forming a C(6) chain along [010].

4-Hy­droxy­indan-1-one

The mol­ecule of the title compound, C₉H₈O₂, is essentially planar except for the methyl­ene H atoms [maximum deviation = 0.028 (1) Å]. In the crystal, the mol­ecules are linked by classical O—H...O hydrogen bonds and weak C—H...O inter­actions into chains along [110] and [1-10].