A new method for the direct α-alkynylation of ethers C(sp³)-H bond with terminal alkynes C(sp)-H bond is described in good yields in the presence of a pincer ligand and copper(II) ion under mild conditions. The catalytic reaction is compatible with various functional groups. Investigation of the mechanism indicates a catalytic cycle involving a radical process and the cleavage of ether C(sp³)-H bond affording the α-oxy radical is the rate-determining step.

中文翻译：

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在温和条件下铜催化醚的直接α-炔基化

描述了一种在温和条件下在夹钳配体和铜（II）离子存在下以高收率高收率地将醚C（sp ³）-H键与末端炔烃C（sp）-H键直接进行α-炔基化的新方法。催化反应与各种官能团相容。对机理的研究表明，涉及自由基过程的催化循环和提供α-氧基的醚C（sp ³）-H键的裂解是决定速率的步骤。