Published in Henry Rzepa's Blog

C 2 (dicarbon) is certainly interesting from a theoretical point of view. Whether or not it can be described as having a quadruple bond has induced much passionate discussion[cite]10.1038/nchem.1263[/cite],[cite]10.1002/anie.201208206[/cite],[cite]10.1002/anie.201301485[/cite],[cite]10.1002/anie.201302350[/cite]. Its occurrence in space and in flames is also well-known.

References

General ChemistryCatalysis

Critical Comments on “One Molecule, Two Atoms, Three Views, Four Bonds?”

Published in Angewandte Chemie International Edition
Authors Gernot Frenking, Markus Hermann

The arguments that are given in the original trialogue in favor of a quadruply bonded C2, in which the bond is claimed to be stronger than that in HCCH, are judged invalid by the authors of this Correspondence. They also disagree with some statements about the stability of molecules and the virtue of chemical research beyond synthetic chemistry.