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An olefin‐assisted, palladium‐catalyzed oxidative alkynylation of enallenes for regio‐ and stereoselective synthesis of substituted trienynes has been developed. The reaction shows a broad substrate scope and good tolerance for various functional groups on the allene moiety, including carboxylic acid esters, free hydroxyls, imides, and alkyl groups. Also, a wide range of terminal alkynes with electron‐donating...
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