title: 13C NMR spectroscopy for the differentiation of enantiomers using chiral solvating agents.
abstract: The utility of (13)C NMR spectroscopy for the differentiation of enantiomers using chiral solvating agents (CSA) is stated. Three examples involving the enantiodifferentiation of a drug, a metabolite and a reactant in aqueous and organic solutions have been chosen to show it. The intrinsic high dispersion of (13)C nucleus, as well as the singlet nature of the signals in standard experiments makes (13)C NMR experiments a powerful alternative or complement to (1)H NMR experiments; specially, when studying pure compounds with complex proton spectra or mixtures of compounds, as in chiral metabonomics, where severe overlapping exists in proton spectrum. To evaluate and compare the quality of the enantioresolution of a NMR signal we introduce the enantiodifferentiation quotient, E, that considers the complexity of (1)H multiplets (and in general the width) of the original signal. It has been observed that the error in the measurement of the enantiomeric molar ratio can be related to the E value. The sensitivity and experimental time of a wide range of chiral analyte concentrations were also assessed.
authors.affiliation: Servei de Ressonància Magnètica Nuclear, Facultat de Ciències i Biociències, Universitat Autònoma de Barcelona , Bellaterra 08193, Catalonia, Spain.
authors.forename: Míriam
authors.initials: M
authors.lastname: Pérez-Trujillo
authors.forename: Eva
authors.initials: E
authors.lastname: Monteagudo
authors.forename: Teodor
authors.initials: T
authors.lastname: Parella
mesh_terms: D002250:Carbon Radioisotopes; D006571:Heterocyclic Compounds / Q000032:analysis* / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D012996:Solutions; D012997:Solvents / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D002250:Carbon Radioisotopes; D006571:Heterocyclic Compounds; D012996:Solutions; D012997:Solvents