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Synthesen, Enantiomerentrennungen, Circulardichroismus, Racemisierungsschwellen, Röntgenstrukturanalysen und absolute Konformation neuer, gut zugänglicher Arenicene

Vögtle, Fritz ; Palmer, M. ; Fritz, E. ; Lehmann, U. ; Meurer, Kurt ; Mannschreck, Albrecht ; Kastner, F. ; Irngartinger, H. ; Huber-Patz, U. ; Puff, Heinrich ; Friedrichs, E.



Abstract

The new helical compounds 1–3 have been synthesized. 1 and 2 are separated into the enantiomers by chromatography on cellulose triacetate. The rotatory powers are high: e.g., [α]math image = 2096 for 1. The racemization/ring inversion barriers range between 115 and 125 kJ/mol. X-ray analyses of 1–3 reveal different torsional angles between the rings ABC from 3.6 to 10.4°. They are compensated ...

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