Palladium-catalyzed self-coupling reaction of terminal alkynes in the presence of p-chloranil: A practical method for the synthesis of triethynylethenes
Pd-catalyzed reaction of aliphatic-1-alkynes in the presence of p-chloranil afforded triethynylethenes as exclusive self-coupling products in good yields. On the other hand, diynes were obtained when aromatic alkynes were used. ... The palladium-catalyzed coupling reaction has proved to be an extremely powerful tool to construct carbon-carbon bonds. [8] In a typical Pd-catalyzed process, oxidative coupling of terminal alkynes occurred in the presence of oxidants, such ...