Synthese mittlerer und großer Ringe, XVI. Bootförmige Arene — Synthese, Struktur und Eigenschaften von [7]Paracyclophanen und [7](1,4)Naphthalinophanen

作者: Jürgen Hunger , Christian Wolff , Werner Tochtermann , Eva-Maria Peters , Karl Peters

DOI: 10.1002/CBER.19861190904

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摘要: Eine praparative Synthese der Titelverbindungen 2, 5, 7 und 11, ausgehend von Cyclononanon, wird beschrieben. Schlusselschritte sind die Uberfuhrung 5,6,7,8,9,10-Hexahydro-4H-cyclonona[c]furan in β,β′ -Heptanooxepine 1, sich desoxygenieren lassen. Die NMR-Spektren neuen Cyclophane werden eingehend diskutiert. Rontgenstrukturanalysen 5 11 liefern Deformationswinkel α zwischen 13.6° 15.9° fur bootformigen heptanouberbruckten Benzolringe. Heptanouberbruckte Ansaverbindungen stellen verschiedener Hinsicht interessante Grenzfalle dar: Fur Oxepine 9 15 konnte ein Valenztautomeriegleichgewicht mit den entsprechenden [7]Cyclophanoxiden 10 16 sehr wahrscheinlich gemacht werden. Das Bis(acetoxymethyl)[7]paracyclophan 2c addiert unter milden Bedingungen Chlor. 12 liegt nicht als β-Naphthol, sondern „nicht-enolisiertes” Keton vor. Synthesis of Medium and Large Rings, XVI. Boat-shaped Arenes — Synthesis, Structure, Properties [7]Paracyclophanes [7](1,4)Naphthalinophanes A preparative synthesis the compounds 7, starting from cyclononanone is described. Key steps are conversion 5,6,7,8,9,10-hexahydro-4H-cyclonona[c]furan to β,β′-heptanooxepines which can be desoxygenated. The NMR spectra new cyclophanes discussed detail. deformation angles boat-shaped heptanobridged benzene rings were determined for by X-ray analysis. Values between found. In several respects ansa interesting borderline cases: oxepines probably exist a valence tautomeric equilibrium with corresponding [7]cyclophane oxides 16. bis(acetoxymethyl)[7]paracyclophane still adds chlorine under mild conditions. does not as β-naphthol but „non-enolized” ketone.

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