𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Revised assignment of the 1H NMR spectrum of the quinolizidine alkaloid lupinine

✍ Scribed by David S. Rycroft; David J. Robins; Ian H. Sadler

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
273 KB
Volume
30
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The ^1^H NMR spectrum of the quinolizidine alkaloid lupinine was studied at 200 and 600 MHz. A full assignment of the ^1^H signals was achieved by application of a variety of NMR techniques, including homonuclear ^1^H NOE difference, 2D δ~H~/δ~H~ COSY and direct δ~C~/δ~H~ correlation experiments. This results in some changes to the current literature assignments; particularly important is the conclusion that the chemical shift difference between the equatorial (β) and axial (α) protons at C‐9 is negative (−0.47 ppm) rather than positive. The currently accepted assignment of the ^13^C NMR spectrum has been confirmed by independent, and more direct, means.

📜 SIMILAR VOLUMES

Assignment of the 1H and 13C NMR spectra
Assignment of the 1H and 13C NMR spectra of the quinolizidine alkaloid anagyrine and determination of its conformation
✍ David S. Rycroft; David J. Robins; Ian H. Sadler 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 430 KB

## Abstract The ^1^H NMR spectrum of the quinolizidine alkaloid ( − )‐ anagyrine has been studied at 200 and 600 MHz. A full assignment of the ^1^H signals has been achieved by application of a variety of NMR techniques, including homo‐nuclear spin decoupling, NOE difference, 2D δ~H~/δ~H~ COSY and

Relative and absolute configurations of
Relative and absolute configurations of the quinolizidine alkaloids anagyrine and thermopsine and assignment of the 1H and 13C NMR spectra of anagyrine
✍ David J. Robins; David S. Rycroft 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 248 KB

## Abstract A recent proposal to revise the relative configurations of the quinolizidine alkaloids anagyrine and thermopsine is refuted. ^1^H and ^13^C NMR chemical shift assignments of anagyrine which were published at the same time are erroneous, and assignments published slightly earlier by the

Assignment of the 13C NMR spectrum of an
Assignment of the 13C NMR spectrum of anisomycin and the 1H and 13C NMR spectra of deacetylanisomycin
✍ J. W. LeFevre; S. E. Maier; W. Deng 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 260 KB

## Abstract The ^13^C NMR spectrum of anisomycin and the ^1^H and ^13^C NMR spectra of deacetylanisomycin were assigned using one‐ and two‐dimensional NMR analysis. The techniques included INEPT, ^1^H^13^C HETCORR and ^1^H‐^1^H COSY spectroscopy.

On the assignment of the carbon-13 NMR s
On the assignment of the carbon-13 NMR spectrum of bilirubin
✍ Doron Kaplan; Gil Navon 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 389 KB

## Abstract An individual assignment of certain peaks in the proton and ^13^C NMR spectra of bilirubin and of bilirubin dimethyl ester is described. The assignment was achieved through the spectra of vinylneoxanthobilirubinic acid and by off‐resonance decoupled ^13^C spectra of bilirubin dimethyl e

The 250 MHz 1H NMR spectrum of cinnoline
The 250 MHz 1H NMR spectrum of cinnoline
✍ Giuseppe C. Pappalardo; Salvatore Gruttadauria; Henri Le Bail 📂 Article 📅 1975 🏛 John Wiley and Sons 🌐 English ⚖ 376 KB

## Abstract The proton NMR spectrum of cinnoline has been measured at high field (250 MHz) and analysed as an H‐8‐de‐coupled ABCXY and H‐4‐decoupled ABCX system. Inter‐ring HH couplings have been determined and discussed in relation to theoretical values obtained using INDO calculations.