𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Carbon-13 NMR chemical shifts in some substituted 1,2,4-triazol-3-ones

✍ Scribed by William M. Litchman; Ulrich Hollstein; E. Paul Papadopoulos

Publisher
John Wiley and Sons
Year
1978
Tongue
English
Weight
643 KB
Volume
11
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Carbon‐13 NMR data for 15 substituted 1,2,4‐triazol‐3‐ones are presented and discussed with regard to enolization in the neutral molecules. The coupling constant and chemical shift data show that the proton at N‐2 is not exchanging rapidly in the DMSO‐d~6~ solvent. Using D~2~OOD^−^ as a solvent, it is found that the C‐3 and C‐5 resonances are shifted downfield by nearly the same amount, suggesting that the proton at N‐4 is being removed. Enolization in the neutral molecules does not occur to any significant extent.

📜 SIMILAR VOLUMES

Carbon-13 NMR chemical shifts in substit
Carbon-13 NMR chemical shifts in substituted 4,4-dimethyl-2-phenyl-1,3-oxazolines
✍ M. Evers; L. Christiaens; G. Llabres; M. Baiwir 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 162 KB

A13C NMR study of twenty-one 4.4dimethyl-2-phenyl-l.3-oxazolines has shown that the chemical shifts of the oxazoline moiety are insensitive towards substitution on the phenyl ring.

Carbon-13 NMR investigation of some subs
Carbon-13 NMR investigation of some substituted 1,3-thiazolidin-4-ones
✍ Christopher Richard Joseph Woolston; John Barry Lee; Frederick John Swinbourne 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 300 KB

## Abstract The ^13^C NMR spectra of a series of 2,3‐diaryl‐1,3‐thiazolidin‐4‐ones were measured and the resonance signals produced by the methylene, methine and carbonyl groups of the heterocyclic ring assigned. The variations in their chemical shifts were examined and the influence of __S__‐oxida

13C NMR chemical shifts of 2,4,5,- tri-s
13C NMR chemical shifts of 2,4,5,- tri-substituted 2H-pyridazin-3-ones
✍ T. Liptaj; V. Konečny; Š Kovác 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 155 KB

## Abstract The ^13^C NMR spectra of a series of 2‐X‐4‐Y‐5‐Z‐substituted 2H‐pyridazin‐3‐ones were measured and assigned on the basis of results from one‐dimensional semi‐selective INEPT or one‐dimensional relayed coherence transfer (HICUUP) experiments.

13C NMR chemical shift assignments for s
13C NMR chemical shift assignments for some 2-substituted cyclic 1,3-diketones
✍ Michael P. Sammes; Prem Nath Maini 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 154 KB

Complete 13C NMR chemical shift assignments are reported for 32 cyclic and one acyclic 1.3-diketones, either unsubstituted or having one or two substituents at the 2-position. The first two classes exist exclusively in the enol form in (CD,),SO and as mixed tautomers in CDCI,.