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Characterization of stereoisomeric 5‐(2‐nitro‐1‐phenylethyl)furan‐2(5 H )‐ones by computation of 1 H and 13 C NMR chemical shifts and electronic circular dichroism spectra
Author(s) -
Lopes Dayane T.,
Hoye Thomas R.,
Alvarenga Elson S.
Publication year - 2021
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.5073
Subject(s) - diastereomer , chemistry , furan , absolute configuration , chemical shift , density functional theory , stereochemistry , proton nmr , carbon 13 nmr , computational chemistry , organic chemistry
In the present work, we describe the preparation of two diastereomers from the enantioselective Michael addition of furan‐2(5 H )‐one to ( E )‐(2‐nitrovinyl)benzene catalyzed by a dinuclear Zn‐complex. The relative configurations of the diastereomeric products were assigned by comparing nuclear magnetic resonance (NMR) experimental chemical shift data with those computed by density functional theory (DFT) methods. Corrected mean absolute error (CMAE) and CP3 analyses were used to compare the data sets. The absolute configuration of each diastereomer was initially assigned by analysis of electronic circular dichroism (ECD) data, which was consistent with that of the known X‐ray crystallographic structure of the product of a related reaction, namely, ( R )‐5‐(( R )‐1‐(4‐chlorophenyl)‐2‐nitroethyl)furan‐2(5 H )‐one.