期刊
CHEMICAL SOCIETY REVIEWS
卷 43, 期 14, 页码 4909-4921出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cs00012a
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资金
- USA NSF [CHE-105-7466]
- Spanish Secretaria de Estado de Investigacion, Desarrollo e Innovacion
- CAM [CTQ2010-20714-C02-01, CTQ2010-16959, CSD2007-00006, S2009/PPQ-1634]
- University of the Basque Country (UPV/EHU) [UFI11/22 QOSYC]
- Basque Government (GV/EJ) [IT-324-07]
Aromaticity is an essential concept in chemistry, employed to account for the unusual stability, reactivity, molecular structures, and other properties of many unsaturated organic compounds. This concept was later extended to inorganic molecules and to saturated systems with mobile electrons, as well as to transition structures, the focus of the present review. Although transition structures are inherently delocalized, not all exhibit aromaticity. We contrast here examples of pericyclic reaction transition structures (where aromaticity is significant) with those for illustrative pseudo-pericyclic reactions (where aromaticity is less or not important). Non-pericyclic reactions may also have aromatic transition structures. State-of-the-art computational methods to evaluate the aromaticity of transition structures are described briefly.
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