Markovnikov Hydration. The purified alkyne (5 mmol) was treated with a solution of HNTf2 (60-200 mol%) in 1,4-dioxane in apreheated oil bath at 100°C, under magnetic stirring, for 18-52 h, and thecorresponding ketone was purified by column chromatography after cooling. Ketone 7. The reactioncrude was purified by column chromatography using 20% AcOEt in n-hexane as an eluent. Isolated
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