Inverted Carbon Geometries: Challenges to Experiment and Theory
Autor: | Harald Untenecker, Peter R. Schreiner, Matthias Bremer, Andrey A. Fokin, Pavel A. Gunchenko |
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Rok vydání: | 2015 |
Předmět: | |
Zdroj: | The Journal of Organic Chemistry. 80:6520-6524 |
ISSN: | 1520-6904 0022-3263 |
DOI: | 10.1021/acs.joc.5b00845 |
Popis: | Disproving a long C-C-bond textbook example: The reported 1.643 Å C-C bond in 5-cyano-1,3-dehydroadamantane was redetermined and "only" amounts to 1.584 Å. While this value is well reproduced with ab initio methods, some common DFT approaches perform poorly and are only consistent with CCSD(T)/cc-pVTZ optimizations for noninverted carbons. Large deviations from experiment were also found for other molecules with atypical electron density distributions, e.g., cubane, bicyclo[2.2.0]hexane, and bicyclo[2.1.0]- and bicyclo[1.1.1]pentane, thereby presenting challenging structures for some DFT implementations. |
Databáze: | OpenAIRE |
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