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The addition of water (100 mol %) afforded the cyclic ether 2 in quantitative yield and with excellent selectivity (entry 4). This further supports the notion that triethylsilyl bromide is not the active catalyst.
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Interestingly, the nature of the triorganosilyloxy protecting group is inconsequential in terms of the overall reaction efficiency and selectivity (TES ∼ TBS ∼ TIPS).
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