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Local Aromaticity of [n]Acenes, [n]Phenacenes, and [n]Helicenes (n= 1−9)

Portella, Guillem, Poater, Jordi, Bofill, Josep M., Alemany, Pere, Solà, Miquel·2005·The Journal of Organic Chemistry

Abstract

The local aromaticity of the six-membered rings in three series of benzenoid compounds, namely, the [n]acenes, [n]phenacenes, and [n]helicenes for n = 1-9, has been assessed by means of three probes of local aromaticity based on structural, magnetic, and electron delocalization properties. For [n]acenes our analysis shows that the more reactive inner rings are more aromatic than the outer rings. For [n]phenacenes, all indicators of aromaticity show that the external rings are the most aromatic. From the external to the central ring, the local aromaticity varies in a damped alternate way. The trends for the [n]helicene series are the same as those found for [n]phenacenes. Despite the departure from planarity in [n]helicenes, only a very slight loss of aromaticity is detected in [n]helicenes as compared to the corresponding [n]phenacenes. Finally, because of magnetic couplings between superimposed six-membered rings in the higher members of the [n]helicenes series, we have demonstrated that the NICS indicator of aromaticity artificially increases the local aromaticity of their most external rings.

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Metadata

Authors
Portella, G., Poater, J., Bofill, J. M., Alemany, P., & Solà, M.
Venue
The Journal of Organic Chemistry
Published
2005-02-24
Volume
70
Issue
7
Pages
2509-2521
ISSN
  • 0022-3263 (ISSN-L)
  • 1520-6904
OpenAlex
W2005856936
Cited by
224
References
5
FWCI
8.14
Type
journal article
Language
en
Open access
closed

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