The 2D NOESY method was used to determine the E/Z configuration and s-cis/s-trans conformation in a series of 3acylmethylene-2,2,3-trisubstituted-2,3-dihydrofurans. The assignments of 1 H and 13 C NMR chemical shifts and J 13 C, 1 H) coupling constants are presented.
β¦ LIBER β¦
New D3 and C3h cryptophanes with ethylenic bridges : Syntheses, structural assignments, and absolute configurations and circular dichroism of the D3 isomers
β Scribed by Jacqueline Gabard; Josette Canceill; Andre Collet
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- French
- Weight
- 629 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0040-4020
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K 2 W 6 Br 14 (I), Rb 2 W 6 Br 14 (II), and Cs 2 W 6 Br 14 (III) were formed by reactions of W 6 Br 12 with the corresponding alkali metal bromides in evacuated silica tubes with a temperature gradient of 925 K/915 K. (I) crystallizes in the cubic space group Pn3 (no. 201), a = 13.808 A Γ , Z = 4, c