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The title compound, C 18 H 16 O 2 , was prepared by reduction of 2-(5,6,7,8-tetra­hydro-2-naphtho­yl)benzoic acid with zinc dust. The benzene ring in the tetra­hydro­naphthyl substituent is nearly perpendicular to the plane of the isobenzofuran-1(3 H )-one ring [87.15 (4)°]. The cyclo­hexane unit has a half-chair conformation in which two methylene groups in the tetra­methyl­ene bridge are disordered over two positions; the site-occupancy factors are 0.838 (4) and 0.162 (4). The crystal structure exhibits alternating isobenzofuran-1(3 H )-one and tetra­hydro­naphthalene layers.

3-(5,6,7,8-Tetrahydro-2-naphthyl)isobenzofuran-1(3H)-one