title: 4,4-Dichloro-tricyclo-[5.4.0.0]undeca-7,9,11-triene.
abstract: The title compound, C(11)H(10)Cl(2), is a useful inter-mediate for the synthesis of 1H-cyclo-propa[b]naphthalene. Strain in the mol-ecule is evidenced by the fact that the cyclo-hexane ring is essentially planar and nearly coplanar with the benzene ring [dihedral angle 1.87 (18)°], and the cyclo-propyl ring is almost perpendicular to the cyclo-hexane ring [dihedral angle 70.99 (12)°]. The mol-ecules are loosely connected into one-dimensional chains by inter-molecular Cl⋯Cl inter-actions 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.
authors.forename: Wan-Li
authors.initials: WL
authors.lastname: Chen
authors.forename: Guo-Sheng
authors.initials: GS
authors.lastname: Chen
authors.forename: Ying-Hong
authors.initials: YH
authors.lastname: Zhu
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Mo