𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The structure of 1,2-dithioles studied by 13C n.m.r. spectroscopy

✍ Scribed by Erik G. Frandsen; Jens P. Jacobsen

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
331 KB
Volume
10
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The charge separation between the dithiole ring and oxygen in 3‐(1′,2′‐dithiole‐3′‐ylidene)‐6‐methyl‐2,3‐dihydropyran‐2,4‐diones and 3‐(1′,2′‐dithiole‐3′‐ylidene)‐2,3‐dihydrobenzo[b] pyran‐2,4‐diones has been determined by ^13^C and ^19^F n.m.r. spectroscopy. By both methods it is found that these compounds are relatively polar. A correlation is established between the ^13^C chemical shift of some carbon atoms and the S2p binding energies measured by e.s.c.a. in the 1,2‐dithiole derivatives. This correlation shows that these ^13^C shifts depend on the positive charge taken by the 1,2‐dithiole ring and can then constitute a convenient evaluation of this charge.

📜 SIMILAR VOLUMES

N.m.r. studies in the heterocyclic serie
N.m.r. studies in the heterocyclic series: XVI—determination of the structure of 3-azidoindazole by 1H and 13C n.m.r. spectroscopy
✍ Alain Fruchier; Ermitas Alcalde; José Elguero 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 155 KB 👁 1 views

## Abstract The 1‐NH structure for 3‐azidoindazole has been demonstrated by the observation of ^1^H^1^H and ^13^C^1^H couplings involving the hydrogen atom attached to nitrogen. A comparison between 3‐azidoindazole and indazole shows that both compounds have the same tautomeric structure.

Ionisation behaviour of lactose and lact
Ionisation behaviour of lactose and lactulose in water as studied by 13C-n.m.r. spectroscopy
✍ Gert de Wit; Antonius P.G. Kieboom; Herman van Bekkum 📂 Article 📅 1984 🏛 Elsevier Science 🌐 English ⚖ 354 KB

From 13C-n.m.r. titration measurements on aqueous solutions of the disaccharides lactose (M) and lactulose (1.1~) at 3-Y, pK, values for a4actopyranose (134, /34actopyranose (13.8), and p-lactulopyranose (13.9) have been derived. These values are close to those for D-glucose and D-fIWtOSe, respectiv

Investigation of substituent effects of
Investigation of substituent effects of chalcones by 13C n.m.r. spectroscopy
✍ E. Soĺǎniová; Š. Toma; S. Gronowitz 📂 Article 📅 1976 🏛 John Wiley and Sons 🌐 English ⚖ 450 KB 👁 1 views

## Abstract ^13^C chemical shifts for 23 __para__‐ and __meta__‐substituted chalcones of the types **1** and **2** have been determined. The aromatic shieldings are compared with previous results for other aromatic derivatives. Correlations of the ^13^C chemical shifts of vinyl carbons and carbonyl