## Abstract ^13^C chemical shifts for 23 __para__‐ and __meta__‐substituted chalcones of the types **1** and **2** have been determined. The aromatic shieldings are compared with previous results for other aromatic derivatives. Correlations of the ^13^C chemical shifts of vinyl carbons and carbonyl
Application of carbon-13 n.m.r. Spectroscopy to the structural investigation of ezomycins
✍ Scribed by Kanzo Sakata; Jun Uzawa; Akira Sakurai
- Publisher
- John Wiley and Sons
- Year
- 1977
- Tongue
- English
- Weight
- 485 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract The ^13^C n.m.r. spectra of the 5β‐hydroxylated phytoecdysones polypodine B, muristerone A and kaladasterone are presented and briefly discussed together with the spectrum of makisterone A. Comparisons with previously reported spectra of ecdysone, ecdysterone and poststerone are made an
## Abstract The ^13^C n.m.r. spectra of the __N__‐methylated mono‐ and diazanaphthalenes have been recorded and analysed. It has been shown that __N__‐methylation as well as __N__‐protonation in cinnoline occur predominantly at the β‐nitrogen atom. __N__‐methylation and __N__‐protonation show a sim
## Abstract Linear correlation coefficients were obtained for the substituent effect of the nitro group in primary nitroalkanes. The solvent effect of chloroform is also discussed, as well as the influence of the scalar relaxation on the half‐width of α‐carbons in ^13^C n.m.r. spectroscopy.
## Abstract The conformational preference of the thymine base ring with respect to the sugar ring in β,β,β,‐trichloroethyl 5′amino‐5′‐deoxythymidine‐5′‐phosphate has been studied by ^13^C n.m.r. spectroscopy. The magnitude of the three bond vicinal coupling constant, __J__(C‐2, H‐1′), for β,β,β‐tri
## Abstract ^15^N and ^13^C chemical shifts and the ^1^__J__(^15^N^15^N), ^1^__J__(^15^N^13^C) and ^1^__J__(^13^CH) coupling constants have been determined for a number of ^15^N‐enriched cyclic and acyclic secondary nitramines. The results are interpreted in terms of both electronegativity effects