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The title compound, C 11 H 10 Cl 2 , is a useful inter­mediate for the synthesis of 1 H -cyclo­propa[ b ]naphthalene. Strain in the mol­ecule is evidenced by the fact that the cyclo­hexane ring is essentially planar and nearly coplanar with the benzene ring [dihedral angle 1.87 (18)°], and the cyclo­propyl ring is almost perpendicular to the cyclo­hexane ring [dihedral angle 70.99 (12)°]. The mol­ecules are loosely connected into one-dimensional chains by inter­molecular Cl⋯Cl inter­actions with a distance of 3.571 (1) Å. The centroid-to-centroid distance between stacked benzene rings is  ca  5.89 Å, indicating that no π–π stacking exists in the crystal structure.

4,4-Dichlorotricyclo[5.4.0.03,5]undeca-7,9,11-triene

4,4-Dichlorotricyclo[5.4.0.0^3,5]undeca-7,9,11-triene