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Conformational behaviour of some trifluoroenaminones by multinuclear magnetic resonance
Author(s) -
Wöjcik Jacek,
Domalewski Wojciech,
KamieńskaTrela Krystyna,
Stefaniak Lech,
Vdovienko Siergiej I.,
Gerus Igor. I.,
Gorbunova Marina G.
Publication year - 1993
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260310904
Subject(s) - chemistry , heteronuclear molecule , coupling constant , chemical shift , conjugated system , nitrogen atom , crystallography , resonance (particle physics) , spectral line , atom (system on chip) , decoupling (probability) , stereochemistry , nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , atomic physics , ring (chemistry) , organic chemistry , physics , particle physics , astronomy , computer science , embedded system , polymer , control engineering , engineering
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 CN 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.