The copper(II)—mediated coupling reaction of alkenyldialkyl- or trialkyl-boranes with alkynylcopper compounds (generated in situ), in the presence of appropriate solvents and a small amount of water, gives (E)-1,3-enynes (or disubstituted alkynes) with various functional groups in reasonable yields.
Y. Masuda and K. Sato, Chem. Commun., 1998, 807 DOI: 10.1039/A800242H
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