✦ LIBER ✦

13C-NMR study of aqueous glutaraldehyde equilibria

✍ Scribed by C. E. Holloway; F. H. Dean

Publisher: John Wiley and Sons
Year: 1975
Tongue: English
Weight: 222 KB
Volume: 64
Category: Article
ISSN: 0022-3549
DOI: 10.1002/jps.2600640657

No coin nor oath required. For personal study only.

✦ Synopsis

the cleavage of a tiglic acid ester (7). In molephantin the base peak is at mle 69, due to the methacrylate side chain. Acetylation of molephantinin with acetic anhydride in pyridine gave an acetate (111, C22H2607, mle 402.1670 (M+), mp 131°, which also showed comparable IR and NMR spectra to those of molephantin acetate (V).

Extensive NMR decoupling (100 MHz) led to the following assignment of protons, which was consistent with the structure of molephantinin acetate as depicted in 11: 6 6.92 (lH, br m, H-19), 6.57 (lH, s, 13), 6.04 (lH, br s, H-3), 5.77 (lH, d, J = 2.0 Hz, H-J = 3.5 Hz, H-61, 3.40 ([H, m, H-7), 2.62 (2H, m, H-9), 2.07 (3H, S, OCOCH3), 1.98 (3H, d, J = 1.5 Hz, H-15), 1.83 (6H, m, H-18 and H-20), and 1.80 (3H, d, J < 1.0 Hz, H-14). For example, irradiation of the

📜 SIMILAR VOLUMES

Conformational equilibria in isomeric me

Conformational equilibria in isomeric methylcyclohexanols studied by 13C NMR spectroscopy

✍ O. A. Subbotin; N. M. Sergeyev; V. N. Chlopkov; N. G. Nikishova; Yu. G. Bundel 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 319 KB

## Abstract The conformational equilibrium constants for isomeric methylcyclohexanols (__cis__‐ and __trans__‐1,2‐, 1,3‐ and 1,4‐methylcyclohexanols) have been determined from peak area measurements in the completely proton decoupled low temperature ^13^C NMR spectra of the individual conformers. T

13C NMR study of quipazines

✍ P. Joseph-Nathan; C. García-Martínez 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 446 KB

## Abstract The complete assignment of the ^13^C NMR spectra of a series of biologically active quipazines substituted at position C‐5, C‐6 or C‐7 of the quinoline moiety provides evidence for a strong conjugation between the π‐electron cloud of the pyridine ring and the nitrogen lone pair of the p

13C NMR studies of fluoroflavones

✍ Amar Habsaoui; Jean-Claude Wallet; Emile M. Gaydou 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 177 KB 👁 2 views

13C NMR chemical shifts were measured in for Ñuorocarbonyl compounds. Sulfonic DMSO-d 6 derivatives display 4J(C,F) coupling constants for carbonyl groups which are also obtained from non-sulfonic derivatives when they are recorded in acidic solution.

13C NMR studies of methylnucleosides

✍ Ching-jer Chang; Dennis J. Ashworth; Lih-Ju Chern; Jose DaSilva Gomes; Chi-Gen L 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 384 KB

The "C chemical shifts of 22 methylated ribonucleosides and deoxyribonucleosides have been measured and assigned. The chemical s h i f t ditierences between methylated and unmodified nucleosides are correlated with their characteristic modifications of structure. The significance of the chemical shi

Conformational study of phosphothreonine

Conformational study of phosphothreonine in aqueous solution. H and 13C NMR results

✍ L. Pogliani; D. Ziessow 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 250 KB 👁 1 views

## Abstract The 270 MHz ^1^H and 22.6 MHz ^13^C NMR spectra of DL‐phosphothreonine in D~2~O have been measured and analysed as a function of pD. The __trans__‐__trans__ conformation of the fragment H‐αC‐αC‐βOP predominates at all pD values. The C‐β—O __gauche__ contribution is notably larger fo

13C NMR study of peach oil

✍ Emerson O da Silva; André LBS Bathista; Maria Inês B Tavares; Nicolau Priante Fi 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 92 KB

## Abstract The detailed analysis of peach seed oil was performed using ^1^H and ^13^C NMR spectroscopy. From the ^13^C NMR solution spectra it was possible to detect the content of saturated, mostly palmitic fatty acids (∼100 g kg^−1^), the oleic–linoleic ratio in sn‐1,3 and sn‐2 positions was (2: