<i>a</i><i>ll-anti</i>-Octasilane: Conformation Control of Silicon Chains Using the Bicyclic Trisilane as a Building Block

The perfect all-anti-octasilane composed of two bicyclic trisilane units with trimethylsilyl groups at the termini has been synthesized. Its X-ray crystal structure and spectroscopic data demonstrate the effective σ-delocalization over the silicon framework, which is a definitive difference from the unconstrained n-Si8Me18.