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Conformational behaviour of some trifluoroenaminones by multinuclear magnetic resonance

✍ Scribed by Jacek Wöjcik; Wojciech Domalewski; Krystyna Kamieńska-Trela; Lech Stefaniak; Siergiej I. Vdovienko; Igor. I. Gerus; Marina G. Gorbunova

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
570 KB
Volume
31
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The structures of 4‐N‐methylamino and 4‐N,N‐dimethylamino‐1,1,1‐trifluorobut‐3‐en‐2‐one (1, 2) were solved by means of an analysis of ^1^H, ^1^H and ^1^H, ^13^C coupling constants. NOE measurements, ^13^C, ^1^H heteronuclear correlation and selective decoupling. The spectra of 1 are strongly solvent dependent. Variable‐temperature experiments indicated that in these compounds the double bond character of the CN bond is fairly pronounced and that the p‐electrons from the nitrogen atom are engaged in the conjugated π‐electron system. ^14^N, ^15^N, ^17^O and ^19^F chemical shifts for 1 are reported.

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