摘要：

Abstrct During the past decade, the construction and investigation of expanded acetylenic π-chromophores has become a central area of chemical research. It has been fueled by the availability of new synthetic methods, in particular Pd(0)-catalyzed cross-coupling reactions, the discovery of the antitumor activity of a series of natural compounds possessing reactive enediyne π-chromophores, and the need for new nanoscale molecular and polymeric materials that exhibit unusual electronic and optical functions and properties. In this review, synthetic approaches to the cyclo[n]carbons (cyclo-C n ), n-membered monocyclic rings of sp-hybridized C-atoms with unique electronic structures resulting from two perpendicular systems of conjugated

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