## Abstract The assignment of the proton and carbon signals and conformations of substituted 5,6‐dihydro‐4__H__‐1,3‐oxazines were determined by the combination of ^1^H, ^13^C, COSY and HETCOR spectral data.
Conformational Analysis of Axially Substituted 4,4′-Bi-1,3-dioxanyls
✍ Scribed by Trixi Brandl; Reinhard W. Hoffmann
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 136 KB
- Volume
- 2004
- Category
- Article
- ISSN
- 1434-193X
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Substituents placed on the phenyl rings of 2,3-diphenyl-1,3-thiazolidin-4-one affect the electron density surrounding both the methine proton and the C(2) carbon. These changes are reflected in the differing chemical shifts for these atoms relative to the parent compound. The other carbons in the he
Whereas simple 4,4Ј-bi(1,3-dioxanyl)s 16 and 19 displayed little conformational preference at the inter-ring bond, their derivatives 4 and 13, with equatorial methyl groups in the 5and 5Ј-positions, each showed a strong conformational preference to populate a conformation with a gauche arrangement o
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