2,13-Diaza[5]helicene: synthesis, theoretical calculations and spectroscopic properties
| Autor: | Walter Panzeri, Giovanna Longhi, Andrea Mele, Isabella Natali Sora, Tullio Caronna, Francesca Fontana, Luca Viganò |
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| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
solvent polarity Anthracene Double bond photochemical ring closure 2 13-diaza[5]helicene theoretical calculations NMR Organic Chemistry 13-diaza[5]helicene Photochemistry Solvent chemistry.chemical_compound chemistry Helicene Computational chemistry Soft matter Self-assembly Isoquinoline Conformational isomerism |
| Zdroj: | Arkivoc. 2009:145-155 |
| ISSN: | 1551-7012 |
| DOI: | 10.3998/ark.5550190.0010.812 |
| Popis: | An easy approach to the synthesis of azahelicenes is based on the photochemical cyclisation of symmetrically or asymmetrically 1,2-aryl-substituted double bonds. In the synthesis of 2,13-diaza[5]helicene, irradiation of 9-(2-pyrid-4-yl-vinyl)-benzo[h]isoquinoline yielded 2,9-diaza-dibenzo[a.h]anthracene together with the desired helicene, and the ratio of the two products depends on the solvent. In this paper we suggest that the ratio between the two products should not be ascribed to different transitions induced by the solvent but to different populations of the two Z conformers |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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