The experimentally determined molecular structure of vinyl cation 1 provides clear evidence for the occurrence of extended sigma-conjugation involving the cyclopropyl ring and the beta-C-Si bonds.
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The unique reactivity of molecules under force commands an understanding of structure-mechanochemical activity relationships. While conceptual frameworks for understanding force transduction in many systems are established, systematic investigations into force-coupled molecular torsions are limited. Here, we describe a novel fluorenyl naphthopyran mechanophore for which mechanical force is uniquely coupled to the torsional motions associated with the overall chemical transformation as a result of the conformational rigidity imposed by the fluorene group.
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