A belt-shaped [8]cycloparaphenylene (CPP) and an enantioenriched Mobius-shaped [10]CPP have been synthesized by high-yielding rhodium-catalyzed intramol. cyclotrimerizations of a cyclic dodecayne and a pentadecayne, resp. This Mobius-shaped [10]CPP possesses stable chirality and isolated with high enantiomeric purity. It is evident from the reaction Gibbs energy calcn. that the above irreversible cyclotrimerizations are highly exothermic; therefore establishing that the intramol. alkyne cyclotrimerization is a powerful route to strained cyclic mol. strips. [on SciFinder(R)]
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