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1H NMR separation of epimeric mixtures by lanthanide shift reagents: Analysis of some isoxazolidine derivatives

โœ Scribed by P. Bucci; G. Chidichimo; A. Liguori; G. Menniti; N. Uccella


Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
300 KB
Volume
22
Category
Article
ISSN
0749-1581

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โœฆ Synopsis


Epimeric mixtures of isoHazolidine derivatives were investigated by ' H NMR spectra obtained in the presence of lanthanide shift reagents. The NMR signals of all the components contained in a mixture of 2 , 3 -d i p n e n y l -S -c e ~y ~~~~e s were identified and the LISCA computer program enabled the stereochemistry of the Merent isomers to be established.


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An assignment of relative configurations has been achieved for the diastereomeric racernates(lR2R,lS2S) and (1R2S, 1S2R) of 3,3-dimethyl-l,2-diphenylbuta~-l-ol through the comparative analysis of the respective chemical shifts induced by Eu(fod), in the 'H and '"C NMR spectra, and the corresponding