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On the Twist-Boat Conformation of the Tetrahydropyran Cycle in the Trioxa-Bis-Spiroketal Series |
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| Authors: | M F Grenier-loustalot F Metras L Cottier G Descotes |
| Institution: | 1. Laboratoire de Chimie Organique Physique, ERA CNRS 895 Institut Universitaire de Recherche Scientifique , Avenue Philippon , 64000 , PAU , (France);2. Laboratoire de Chimie Organique , ERA CNRS 689 ESCIL, Université de Chimie Organique , Lyon I 43 Boulevard du 11 Novembre 1918, 69622 , VILLEURBANNE , (France) |
| Abstract: | INTRODUCTION In the solid state the trioxa-bis-spiroketal 2 (fig. 1) has a twist-boat conformation (tetrahydropyran cycle) and its infrared absorption and nuclear magnetic resonance (1H at 250 MHz, 13C at 15,06 MHz) spectra let forsee the same conformation in solution.1. |
| Keywords: | 1H and 13C NMR X-rays twist boat conformation tetahydropyran |