𝔖 Bobbio Scriptorium
✦   LIBER   ✦

17O NMR spectroscopy: Referencing in diamagnetic and paramagnetic solutions

✍ Scribed by Ioannis P. Gerothanassis; Jürgen Lauterwein

Book ID
102951268
Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
598 KB
Volume
24
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Several referencing techniques for measuring 1 7 0 NMR chemical shifts in diamagnetic and paramagnetic solutions have been examined. 1,4-Dioxane is recommended as an external reference standard for diamagnetic solutions because the "0 resonance position is independent of temperature between 27 and 90°C. At 40°C the "0 chemical shift, within experimental error, corresponds to that of doubly distilled water. Nitromethane cannot be considered as a suitable internal reference because of large solvent effects on the 170 chemical shift. Further, in organic solutions its lanthanide-induced chemical shifts are not negligible. For the study of paramagnetic solutions the combined use of a cylindrical and a spherical cell is proposed the 1 7 0 resonance of either the magnetically active solvent or a convenient compound added to the solution is recorded in both cells; the chemical shift difference between the two measurements is the bulk magnetic susceptibility shift.

📜 SIMILAR VOLUMES

17O NMR spectroscopy: Study of intramole
17O NMR spectroscopy: Study of intramolecular hydrogen bonding in phenols and salicylaldehydes
✍ David W. Boykin; S. Chandrasekaran; A. L. Baumstark 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 480 KB

## Abstract Natural abundance ^17^O NMR data for fifteen 2‐ and 4‐substituted phenols, ten 3‐and 5‐substituted 2‐hydroxybenzaldehydes and eight 3‐substituted benzaldehydes, recorded at 75°C in acetonitrile are reported. The chemical shift change due to intramolecular hydrogen bonding for the phenol

Steric effects in the 17O NMR spectrosco
Steric effects in the 17O NMR spectroscopy of aromatic methyl ethers
✍ M. A. Wysocki; P. W. Jardon; G. J. Mains; E. J. Eisenbraun; D. W. Boykin 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 408 KB

0 NMR spectroscopic data (natural abundance) were obtained for 19 methoxy-aromatic compounds: a series of substituted anisoles with a single ortho substituent, a series of 2,Q-disubstituted anisoles, a series of 3-substituted-1, 2-dimethoxybenzenes and three multi-substituted anisole derivatives. Th