𝔖 Bobbio Scriptorium
✦   LIBER   ✦

NMR study of tautomerism of benzofuroxan and its sulphur and selenium analogues

✍ Scribed by Piotr Cmoch; Wojciech Schilf

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
55 KB
Volume
37
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

The possible tautomeric equilibria of benzofuroxan and its sulphur and selenium analogues were examined by multinuclear NMR methods. The 1 H, 13 C, 14 N and 15 N NMR signal assignments were achieved largely by 2D methods and some older nitrogen NMR data were verified. At room temperature and above, only unsubstituted benzofuroxan exhibits tautomeric exchange fast on the NMR time-scale. All remaining compounds exist in this condition as N ! O structures.

📜 SIMILAR VOLUMES

NMR data for sulphur and selenium analog
NMR data for sulphur and selenium analogues of furocoumarin (psoralen)
✍ Andreas Jakobs; Gabriel Llabres; Marcel Baiwir 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 179 KB

## Abstract ^1^H, ^13^C and ^77^Se chemical shifts of sulphur and selenium analogues of furocoumarin are given. These data are very similar to the values obtained from benzofuran, coumarin and their sulphur and selenium analogues.

Selenium-77 NMR chemical shifts of five-
Selenium-77 NMR chemical shifts of five-membered selenium and sulphur heterocycles with CSe, CS, and CO groups
✍ Helmut Poleschner; Reiner Radeglia; Hinrich Meyer 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 427 KB

This paper reports the 77Se NMR chemical shifts of 1,34thiole-, 1,3-thiaselenole-and 1,3-diselenole-2ones, -thiones and -selones, of the corresponding saturated compounds 1,3-diselenolane-2-one, -thione and -selone, and the 1,3-thiaselenolium tetralluoroborates, either unsubstituted or substituted b

NMR studies of the conformational behavi
NMR studies of the conformational behaviour and tautomerism of bis- and tris-saccharidoguanidines
✍ Gábor Tóth; Tamás Gáti; István Pintér; József Kovács; Rainer Haessner 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 139 KB

## Abstract The reaction of an acetyl‐protected symmetrical sugar carbodiimide with amines yielded the corresponding trisubstituted guanidine derivatives **2**–**6** with two or three sugar units. Their tautomerism, isomerism and conformational behaviour were elucidated by application of one‐ and t

Isomerization and conjugation characteri
Isomerization and conjugation characteristics of the CN double bond. III—15N NMR studies of tautomerism in 2-phenylamino-2-thiazoline and its thiazine analogue
✍ Gábor Tóth; Attila Almásy 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 294 KB

## Abstract ^15^N NMR Spectroscopy shows, contrary to earlier suggestions, that 2‐phenylamino‐2‐thiazoline and its thiazine analogue are present in chloroform as an equilibrium of imino and amino tautomers in the ratio of 62:38 and 74:26, respectively.

NMR and semi-empirical study of the taut
NMR and semi-empirical study of the tautomerism of­2,2′-bisbenzimidazolyl
✍ Cesar Zucco; Evandro L. Dall'Oglio; Gean V. Salmória; Hugo Gallardo; Ademir Neve 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 232 KB 👁 1 views

A dynamic NMR study of the tautomerism of 2,2'-bisbenzimidazolyl in DMSO-d 6 and a mechanistic interpretation of the process, based on a stepwise, single-proton transfer and formation of a zwitterionic intermediate, are presented. This interpretation is substantiated by semi-empirical calculations o