✦ LIBER ✦

Distinction between the tautomeric forms of sulfanilamide derivatives by13C- NMR

✍ Scribed by Bult, A.

Publisher: Springer
Year: 1983
Tongue: Dutch
Weight: 172 KB
Volume: 5
Category: Article
ISSN: 1573-739X
DOI: 10.1007/bf01960081

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

13C-NMR study on the tautomerism of 3-(a

13C-NMR study on the tautomerism of 3-(arylhydrazono)methyl-2-oxo-1,2-dihydroquinoxalines between the hydrazone imine and diazenylenamine forms

✍ Yoshihisa Kurasawa; Akiko Takano; Kyoko Kato; Ho Sik Kim; Yoshihisa Okamoto 📂 Article 📅 1997 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 232 KB

## Abstract The ^13^C‐nmr study was carried out for the tautomerism of the 3‐(arylhydrazono)methyl‐2‐oxo‐1,2‐dihy‐droquinoxalines 1a‐g and 2a‐e between the hydrazone imine A and diazenylenamine B forms, providing the carbon chemical shifts for the tautomers A and B of compounds 1a‐g and 2a‐e. The c

Determination of tautomeric phenotypes o

Determination of tautomeric phenotypes of β-thioxo esters and characterization of the tautomeric enethiolic constituents by means of 13C NMR spectroscopy

✍ F. Duus; P. E. Hansen 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 806 KB

The -C NMR spectra of 28 enethiolizable p-thioxo esters and 6 enethiolizable 0-thioxo thioloesters have been recorded in order to establish the tantomeric phenotypes of these compounds. All compounds investigated are essentially enethiolic. The carbonyl-conjugated (2)-enethiol form is the exclusive

Study of the prototropic tautomerism of

Study of the prototropic tautomerism of 8-azatheophylline by 13C and 15N NMR spectroscopy

✍ Gerrit L'abbé; Marie-Anne Persoons; Suzanne Toppet 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 257 KB

Comparison of the "C and "N NMR spectra of 8-azatheophylline with those of its three methylated derivatives and other model compounds from the literature showed that 8-azatheophylline exists to the extent of 80% in the N-2 tautomeric form in DMSO solution.

The studies of tautomerism in 6-mercapto

The studies of tautomerism in 6-mercaptopurine derivatives by 1H–13C, 1H–15N NMR and 13C, 15N CPMAS-experimental and quantum chemical approach

✍ Leszek Pazderski; Iwona Łakomska; Andrzej Wojtczak; Edward Szłyk; Jerzy Sitkowsk 📂 Article 📅 2006 🏛 Elsevier Science 🌐 English ⚖ 233 KB

Heterocyclic β-enamino esters 43—easy 13

Heterocyclic β-enamino esters 43—easy 13C NMR distinction between aryl-substituted dimroth isomers of the 1,2,3-triazole series

✍ H. Wamhoff; J. Bohlen; S. Y. Yang 📂 Article 📅 1986 🏛 John Wiley and Sons 🌐 English ⚖ 313 KB

## 5-Amino -1-aryl-1,2,3-triazoles and 5-anilino-1,2,3-triazoles can be easily distinguished by their "C N M R spectra. Thus, C-4 and C-5 of some studied 5-anilino isomers are deshielded by 2-5 ppm in comparison with the corresponding 5-amino-1-aryl isomers. From the 13C N M R signals of the aryl

Vitamin B6 and derivatives. II—13C NMR s

Vitamin B6 and derivatives. II—13C NMR study of systems formed by pyridoxal phosphate or pyridoxal with octopamine

✍ Raymond Haran; Jean-Pierre Laurent; Michel Massol; Francoise Nepveu-Juras 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 367 KB

## Abstract Schiff base formation by condensation of pyridoxal phosphate or pyridoxal with octopamine in aqueous or methanolic medium was investigated by ^13^C NMR. Enolimine forms are favoured in methanolic solution, whereas in aqueous solution the predominant ketoenamine forms show a hydrogen bon