Gas Chromatographic Separation of Enantiomeric Olefins

✍ Scribed by Dipl.-Chem. Jens Ehlers; Prof. Dr. Wilfried A. König; Dipl.-Chem. Sabine Lutz; Dr. Gerhard Wenz; Prof. Dr. Heindirk tom Dieck

• Publisher: John Wiley and Sons
• Year: 1988
• Tongue: English
• Weight: 532 KB
• Volume: 27
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.198815561

✦ Synopsis

The structure of the host molecules remains virtually unchanged during the adduct formation. Fig. 1. Top: Space-filling model (SCHAKAL program) according to the optimized geometries [23] of the host-guest molecule 2c .pyrene. Bottom: Space-filling model (SCHAKAL program) according to the optimized geometries 1231 of the host-guest molecule Id .pyrene. The examples given here show that arenes are bound by cationic hosts when these are stabilized in the sandwichlike structure of the host-guest complex by strong EDA and/or C T interactions and the otherwise usual factors. It is then unnecessary for the host cavity to be completely enveloped and the charge centers to lie on the periphery.[2,31 As reported in the preceding communications, J . F. Stoddart et al. have synthesized a tetracation of type 1 with two p-xylylene bridges by the method described here and have characterized host-guest compounds containing dimethoxybenzene~.'~'~