A combination of fluorobenziodoxole (FBX) and BF₃ ⋅ OEt₂ in cyclopentyl methyl ether promotes regio‐ and stereoselective addition of benziodoxole and methoxy groups to alkynes. This difunctionalization reaction tolerates a variety of functionalized internal and terminal alkynes to afford trans‐β‐alkoxyvinylbenziodoxoles, which represent versatile precursors to stereochemically well‐defined multisubstituted vinyl ethers. The reaction is proposed to involve cleavage of the I−F bond of FBX by BF₃, followed by electrophilic activation of the alkyne by the resulting cationic I^III species that triggers the nucleophilic addition of the ethereal oxygen.

中文翻译：

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氟代苯并恶唑-BF3试剂，用于在乙醇溶剂中炔烃的碘（III）醚化。

fluorobenziodoxole（FBX）的组合和BF ₃  ⋅OET ₂在环戊基甲基醚促进区域选择性和立体选择性加成benziodoxole和甲氧基与炔烃。这种双官能化反应可耐受各种官能化的内部和末端炔烃，以提供反式-β-烷氧基乙烯基苯并恶唑，这是立体化学定义明确的多取代乙烯基醚的多用途前体。提出该反应涉及通过BF ₃裂解FBX的IF键，然后通过生成的阳离子I ^III物种引发炔的亲电活化，从而触发醚氧的亲核加成。