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In the title compound, C22H34Si2, the two independent mol­ecules are closely similar. The reduced rings show a flattened twist conformation. Several features of [2.2]paracyclo­phane strain (e.g. lengthened bridge bonds) are apparent; an exception is furnished by the normal sp2 values of the angles at the bridgehead atoms of the reduced rings.

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The title compound, C28H52Si4, crystallizes in the uncommon space group I4122 with 222 symmetry. Despite the reduction of the rings, several features of [2.2]paracyclo­phane strain are still apparent.
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