𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Proton polarization transfer in natural abundance 15N NMR studies of E- and Z-isomers of N-alkylformamides

✍ Scribed by O. W. Sørensen; S. Scheibye; S.-O. Lawesson; H. J. Jakobsen

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
314 KB
Volume
16
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Proton polarization transfer has been used for the convenient observation of proton coupled natural abundance ^15^N NMR spectra of the E‐ and Z‐isomers of N‐methylformamide at 10.14 MHz. Second‐order spectral analysis is required to determine the ^15^NH coupling constants, at least for the E‐isomer of secondary formamides. An useful stereospecificity is observed for both the one‐ and two‐bond ^15^NH coupling constants.

📜 SIMILAR VOLUMES

15N NMR study of proton localization and
15N NMR study of proton localization and proton transfer thermodynamics and kinetics in polycrystalline porphycene
✍ Uwe Langer; Christof Hoelger; Bernd Wehrle; Lidia Latanowicz; Emanuel Vogel; Han 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 180 KB 👁 2 views

Using high-resolution solid-state 15 N cross-polarization magic angle spinning NMR techniques, the proton transfer thermodynamics and dynamics and the proton locations in polycrystalline 15 N-labeled porphycene were studied. Whereas at room temperature only a single 15 N resonance is observed, indic

Nitrogen-15 NMR studies of hydrogen bond
Nitrogen-15 NMR studies of hydrogen bonding and proton transfer in complexes of pyridine N-oxides with dichloroacetic acid in CDCl3
✍ Zofia Dega-Szafran; Mirosław Szafran; Jerzy Sitkowski; Lech Stefaniak 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 387 KB 👁 2 views

The "N NMR chemical shifts of eight substituted pyridine N-oxides (B) and their complexes (AHB) with methanol and dichloroacetic and trifluoromethanesulfonic acids were measured in chloroform-d at the natural abundance level. The measured chemical shifts are strongly affected by substituents, hydrog

Combined variable-temperature and variab
Combined variable-temperature and variable-field 15N cross-polarization magic angle spinning NMR study of 15N,14N residual dipolar coupling in pyrazole derivatives
✍ Sergio H. Alarcón; José A. Jiménez; Rosa M. Claramunt; Hans-Heinrich Limbach; Jo 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 88 KB

A study of the residual dipolar 15 N, 14 N coupling observed in 15 N cross-polarization magic angle spinning NMR spectra at variable temperature and variable field in 1-amino-and 1-nitropyrazole is reported. Residual dipolar 15 N, 14 N coupling is present in high-resolution 15 N spectra as an asymme