Bond lengths and angles found in a crystal structure study of 2-formyl-6-dimethylaminopentafulvene suggest that a dipolar form (IIIb) makes a major contribution to the ground-state resonance hybrid.
H. L. Ammon and L. A. Plastas, J. Chem. Soc. D, 1971, 356 DOI: 10.1039/C29710000356
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