Preparation and Structure Determination of a Stable cis-Bis-sigma-homobenzene Derivative

[摘要]：By cyclopropanation of tetramethyl[2,2]paracyclophane 9 the tetramethylene adduct 10 has been prepared. This hydrocarbon is the first stable cis-bis-sigma-homobenzene for which a structure has been determined by X-ray diffraction.

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