| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5292344 | Tetrahedron Letters | 2005 | 5 Pages |
Abstract
A systematic estimation of aromaticity in oxocarbon acids, their dianions, squaramide and its complex with the ammonium cation have been studied using structural and magnetic criteria. Results based on Nucleus Independent Chemical Shift (NICS) predict that deltic and squaric acids and their dianions are aromatic, while croconic and rhodizonic acids and their dianions are non-aromatic. Squaramide is less aromatic than its complex with the ammonium cation. Therefore, the gain in aromaticity in the squaramide ring is a possible explanation for the remarkable hydrogen bond acceptor character of squaramide.
Related Topics
Physical Sciences and Engineering
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Authors
David Quiñonero, Antonio Frontera, Pau Ballester, Pere M *,