2,2,3,3-Tetrachloro-1,4-diphenylbicyclo[2.2.0]hexane, a Strained Bicyclic System

The title compound belongs to the family of bicyclo[2.2.0]hexanes. The bond lengths C1-C4 and C3-C4 of the two four-membered rings are significantly longer than the average bond length for such ring systems [1.554 (21) Å] which is obviously a result of angular strain. Experimental bond lengths in Å: C1-C4 1.607 (3), C3-C4 1.592 (3), C2-C3 1.588 (3), C1-C6 1.577 (3), C4-C5 1.543 (3), C1-C2 1.535 (3), C5-C6 1.535 (4).

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