𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The structure of α-(1,2-dithiole-3-ylidene) ketones and α-(1,2-dithiole-3-ylidene) aldehydes studied by means of n.m.r. spectroscopy

✍ Scribed by Carl Th. Pedersen; Erik G. Frandsen; Kjeld Schaumburg

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
615 KB
Volume
9
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

1H and ^13^C n.m.r. studies of a series of twelve 1,2‐dithiole‐3‐ylidene ketones and aldehydes have shown that the geometry of the carbon backbone is the same as found in 1,6,6aλ^4^‐trithiapentalenes. No evidence has been found which favours a bicyclic structure for the system. A linear correlation of observed ^13^C chemical shifts with calculated charge densities is found to be valid. The observations are in agreement with a structure which is a hybrid between a true ketonic structure and a true mesoionic structure.

By using the difference in the ^13^C chemical shifts of ortho and meta carbon atoms in substituent phenyl groups it is possible to qualify the degree of coplanarity of the phenyl groups with the backbone of the molecule.

📜 SIMILAR VOLUMES

The structure of 1,2-dithioles studied b
The structure of 1,2-dithioles studied by 13C n.m.r. spectroscopy
✍ Erik G. Frandsen; Jens P. Jacobsen 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 331 KB

## 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 f

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.