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Crystal structures and solution conformations of the meso-forms of 2,3,11,12-Tetraphenyl-[18]crown-6

Weber, G. ; Sheldrick, G. M. ; Burgemeister, Thomas ; Dietl, F. ; Mannschreck, Albrecht ; Merz, A.



Abstract

The X-ray crystal stuctures of the achiral cis-anti-cis and trans-syn-trans diastereoisomers of 2,3,11,12-tetraphenyl-[18]-crown-6 and their sodium iodide 1:1 complexes are presented. In the free ligands, the vicinal phenyl groups assume a diaxial- antiperiplanar orientation in the cis-anti-cis isomer and a diequatorial-synclinal one in the trans-syn-trans isomer. The vicinal coupling constants ...

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