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Significance: The synthesis of a fully fused carbon nanobelt (7) — a belt segment of a (6,6)carbon nanotube — has been a long-lasting goal in materials science. Segawa, Itami, and co-workers have now reported on the successful bottom-up synthesis of such a carbon nanobelt, a closed loop of 12 fully fused edge-sharing benzene rings. The synthesis starts with several consecutive Wittig reactions. In the final step, a Ni(cod)2-mediated aryl–aryl coupling reaction prompts the formation of the new fully fused arene system. Comment: The authors studied in detail the optoelectronic and structural properties of this ‘shortest armchair carbon nanotube’. Besides verifying the rigid cylindrical shape of this carbon nanobelt through X-ray crystallography, its photophysical characterization combined with theoretical calculations confirmed the structural rigidity of this fully conjugated arene system. The synthesis of this belt of 12 edge-sharing benzene rings may pave the way towards a precisely controlled singlechirality bottom-up synthesis of (6,6)carbon nanotubes. Br Br

Nanobelt Mission Accomplished: A Loop of 12 Fused Edge-Sharing Benzenes