A Substituted cis,trans,cis,cis-[4.5.5.5]Fenestrene

The title compound, rel-(1S,4R,7R,9S)-tetracyclo[5.4.1.0^4,12.0^9,12]dodec-10-enyl-1-acetic acid, C₁₄H₁₈O₂, has been prepared and its structure elucidated. The geometry of the central C(C)₄ substructure shows a considerable distortion from an ideal tetrahedral arrangement towards planarity, with two opposite bond angles of 119.2 (2) and 134.9 (2)°. The other bridgehead bond angle of the trans-bicyclo[3.3.0]octane subunit is also large, with a value of 128.0 (2)°.

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