Exceptional molecular architectures via cycloadditions to pyrenequinones |
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Authors: | Qian Qin Douglas M Ho Joel T Mague |
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Institution: | a Department of Chemistry, Tulane University, New Orleans, LA 70118, USA b Department of Chemistry, Princeton University, Princeton, NJ 08544, USA |
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Abstract: | The thermal reaction of phencyclone (2) with a 1:1 mixture of 1,8-pyrenequinone (4) and 1,6-pyrenequinone (5) yields 2:1 adducts only of compounds 2 and 4. The observed polycyclic aromatic hydrocarbon 8 is formed via double Diels-Alder addition of 2 to 4, and the polycyclic ketone 9 arises from a combination of Diels-Alder and hetero-Diels-Alder reactions of 2 and 4. In contrast, Lewis acid-catalyzed reactions of 2, 4, and 5 give 2:1 adducts only of 2 and 5. The chief product, polycyclic diketone 10, is derived from a double hetero-Diels-Alder addition of 2 to 5. X-ray analysis of compound 8 shows it to be an exceptionally large polycyclic aromatic arch, and the X-ray structure of 10 reveals it to be a chiral molecular tweezer. |
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Keywords: | Polycyclic aromatic hydrocarbons Diels-Alder reaction Hetero-Diels-Alder reaction |
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