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Tautomerism in some alkyl carboxylates of amino-substituted dihydrobenzoxazepine thiones and dihydrobenzodiazepine thiones studied by 2D NMR spectroscopy. Some stereochemical effects on 2J(C, H) and 3J(C, H) couplings

✍ Scribed by Kalevi Pihlaja; Mario Simeonov; Manfred Michalik; Klaus Peseke; Volker Sinnwell; Jurgen Voss

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
296 KB
Volume
30
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^1^H and ^13^C NMR spectra of some alkyl carboxylates of amino‐substituted dihydrobenzoxazepine thiones and dihydrobenzodiazepine thiones were recorded in CDCI~3~, and DMSO solutions, and the complete spectral assignments performed with 1D and 2D techniques. A solvent‐dependent tautomerization was established for the oxazepine derivatives, whereas the diazepines existed in the same tautomeric form in both solvents. The tautomeric structures are stabilized by strong intramolecular hydrogen bonding. Differences in the CH couplings are related to the stereochemistry of the tautomeric structures.

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Magnitudes and relative sign of J(119Sn,13C) and J(119Sn,H) coupling constants in some vinyltin(IV) compounds obtained by 2D NMR spectroscopy
✍ Antonín Lyčka; Ivan Tkáč; Jaroslav Holeček; Vladimír Pejchal 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 232 KB

## Abstract Two‐dimensional H,C‐COSY spectra of some vinyltin(IV) compounds were measured. The relative signs of __^n^J__(^119^Sn, ^13^C) and __^(n+1)^____J__(^119^Sn, ^1^H) coupling constants were determined after analysis of the orientation of appropriate ^119/117^Sn satellites in H,C‐COSY spectr