𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A theoretical study of tautomerism in dehydroascorbic acid osazone and related tetronic acid derivatives

✍ Scribed by Ahmad S. Shawali; Ikhlass M. Abbas; Nahed F. Abdelfattah; Cyril Párkányi

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
512 KB
Volume
110
Category
Article
ISSN
0008-6215

No coin nor oath required. For personal study only.

✦ Synopsis

The HMO method has been used to study tautomerism in diazonium couplingproducts of tetronic acids (1) and their 4-phenylhydrazones 15, model compounds for dehydroascorbic acid osazone. In addition, HMO calculations have been performed for 2,5-bis@henylhydrazono)cyclopentanone ( 28) and 1,3-bis(phenylhydrazono)-Zindanone (32). The results are consistent with the chelated phenylhydrazone structure 12 and the dichelated bis(phenylhydrazone) structure 19, in agreement with the 13C!-n.m.r. spectral data reported by Gelin and Pollet.

📜 SIMILAR VOLUMES

A semiempirical SCF-MO study of the taut
A semiempirical SCF-MO study of the tautomeric forms of 3-acetyl tetronic- and tetramic acids
✍ H. B. Broughton; P. R. Woodward 📂 Article 📅 1990 🏛 Springer Netherlands 🌐 English ⚖ 415 KB

A number of tautomeric geometries of 3-acetyl tetramic acid and 3-acetyl tetronic acid were examined using the AM 1 and PM3 methods. The results are compared with experimental data and with studies using MNDO and older methods, with the conclusion that both AM 1 and PM3 provide satisfactory models o

The limits of electrostatic potential pr
The limits of electrostatic potential predictions: a theoretical study of nitrous acid and protonated derivatives
✍ A. Dargelos; S. El Ouadi; D. Liotard; M. Chaillet; J. Elguero 📂 Article 📅 1977 🏛 Elsevier Science 🌐 English ⚖ 629 KB

The evaluation of electrostatic, polarization and charge transfer contributions give a powerful description of protonation mechanism. However, electrostatic predictions may be sometimes qualitatively inadequate. As an example, protonated species of the Z and E isomers of nitrous acid are investigate

A solid state and solution NMR study of
A solid state and solution NMR study of the tautomerism in hydroxyquinoline carboxylic acids
✍ Dietrich Gudat; Jacek E. Nycz; Jaroslaw Polanski 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 156 KB 👁 1 views

Some hydroxyquinoline carboxylic acids and their conjugate acids and bases were characterized by 13 C and 15 N NMR spectroscopy in solution and in the solid state. Differences in 13 C and, in particular, 15 N chemical shift patterns allow to distinguish between individual tautomers and confirm the p