Are Allenes with Zwitterionic Character Still Allenes? Of Course!


  • We are grateful to the NSF (CHE 0518675) for financial support of this research, the aNSERC for a Postdoctoral Fellowship (C.A.D.), and the ACS for a Graduate Fellowship (V.L.).


The true ground state of 1 is a matter of debate, but for clarity and convenience the allene resonance form 1 a, is the most appropriate. The arguments for aromaticity made by Christl and Engels are shown to be incorrect.

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