1,3-Diethynylallenes: New Modules for Three-Dimensional Acetylenic Scaffolding.

Regioselective Pd0 -catalyzed cross-coupling of bispropargylic precursors 1 with silyl-protected alkynes gave rise to the first 1,3-diethynylallenes 2 [Eq. (1), LG=leaving group]. In enantiomerically pure form, these novel carbon-rich modules could provide access-by oxidative oligomerization-to a fascinating new class of helical oligomers and polymers.

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