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The preparation of enantiopure dumbbell-type dimeric fullerenes consisting of two C60 units connected by axially chiral alleno-acetylenic spacers is reported for the first time. As a key step, the attachment of the terminal alkyne moiety of the spacers to C60 was efficiently accomplished by employing an in situ C60-ethynylation methodology. In addition to spectral analyses, single-crystal X-ray crystallographic...
A second series of shape‐persistent alleno–acetylenic macrocycles and monodisperse acyclic oligomers with conformationally less flexible backbones were synthesized in enantiomerically pure form by short, high‐yielding routes starting from optically active 1,3‐diethynylallenes. All seven stereoisomers—two pairs of enantiomers and three achiral stereoisomers—in the macrocyclic series were separated...
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