Trimethylsilyl ethers of 1,5-diaryl-3-(trifluoromethyl)pent-1-en-4-yn-3-oles in superacid CFSOH (TfOH) give rise to the corresponding intermediate CF-pentenynyl cations. These species react with benzene to afford conjugated CF-pentenynes, which undergo subsequent cyclization, first, into CF-cycloheptadienes and, finally, into unusual CF-"helicopter"-like bicyclic structures.
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