Synthesis and characterization of new heptacyclic helicenes |
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| Authors: | Habiba Gué douar,Faouzi Aloui,Souad Moussa,Jé rô me Marrot,Bé chir Ben Hassine |
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| Affiliation: | 1. Faculté des Sciences de Monastir, Laboratoire de Synthèse Organique Asymétrique et Catalyse Homogène (UR11ES56), Avenue de l’environnement, 5019 Monastir, Tunisia;2. Université de Versailles-St-Quentin-en-Yvelines, Institut Lavoisier de Versailles, UMR CNRS 8180, 45 Avenue des États-Unis, 78035 Versailles Cedex, France |
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| Abstract: | New helically chiral substituted heptacyclic systems have been prepared from a simple phenanthrene building block in good yields and purity, via a four-step sequence involving palladium-catalysed Heck coupling and oxidative photocyclization. X-ray crystal structure analysis indicated that the conformation resembled that of the unsubstituted heptahelicene. The optical properties of these heptacyclic helicenes were investigated and show interesting behaviour. |
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| Keywords: | Phenanthrene Chirality Helical structures Heck coupling Photocyclization |
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