Concerning carbon-13 n.m.r. spectroscopy of 5β-hydroxylated phytoecdysones
✍ Scribed by J. Krepinsky; J. A. Findlay; B. Danieli; G. Palmisano; P. Beynon; S. Murakami
- Publisher
- John Wiley and Sons
- Year
- 1977
- Tongue
- English
- Weight
- 211 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
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 and allow a correction for the C‐20/C‐24 assignment for ecdysone.
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## 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 complete structure and stereochemical elucidation of flavanone 5,3′,4′‐trihydroxy‐7β‐glucoside has been achieved by the aid of ^13^C n.m.r.
## 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