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Keywords:

  • bond-length alternation;
  • carbyne;
  • cumulenes;
  • oligomers;
  • polyynes
Thumbnail image of graphical abstract

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.