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Synthesis and Structure of Tetraarylcumulenes: Characterization of Bond-Length Alternation versus Molecule Length


  • Funding from the University of Erlangen-Nuremberg and the Deutsche Forschungsgemeinschaft (DFG - SFB 953, Project A4 “Synthetic Carbon Allotropes”) is gratefully acknowledged.


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BLA=0? Not so fast! A series of tetraarylcumulenes up to the length of a [9]cumulene has been synthesized and analyzed by X-ray crystallography. The structural data show a distinct reduction in bond-length alternation (BLA) as a function of molecule length, but this trend appears to reach a limit before a cumulenic structure with BLA=0 is achieved.