“A New Chirally Organized Trifluoromethylanthrylmethanol Derivative and Its Application as Chiral Solvating Agent” By Eva Monteagudo, Pere de March, Ángel Álvarez‐Larena and Albert Virgili. ChemistrySelect, 2017, 2, pp. 7362-7367 DOI:10.1002/slct.201701429
The synthesis and structure of 1,1′‐(((10,10’‐(1,1′‐binaphthalene)‐2,2′‐diylbis(oxy))bis(methylene))bis(anthracene‐10,9‐diyl))bis(2,2,2‐trifluoroethanol), 4, is reported. This compound owns both axial and central chirality allowing its use as a chiral solvating agent (CSA) for the enantiomeric composition determination of several mixtures of chiral aromatic alcohols and amines using NMR. The study of the resulting diastereoisomeric complexes was carried out by determining its stoichiometry and association binding constants.
“Chiral Recognition by Dissolution DNP NMR Spectroscopy of 13C-Labeled DL-Methionine” By Eva Monteagudo, Albert Virgili, Teodor Parella and Míriam Pérez-Trujillo.. Anal. Chem., 2017, 89 (9), pp 4939–4944 DOI: 10.1021/acs.analchem.7b00156
A method based on d-DNP NMR spectroscopy to study chiral recognition is described for the first time. The enantiodifferentiation of a racemic metabolite in a millimolar aqueous solution using a chiral solvating agent was performed. Hyperpolarized 13C-labeled DL-methionine enantiomers were differently observed with a single-scan 13C NMR experiment, while the chiral auxiliary at thermal equilibrium remained unobserved. The method developed entails a step forward in the chiral recognition of small molecules by NMR spectroscopy, opening new possibilities in situations where the sensitivity is limited, for example, when a low concentration of analyte is available or when the measurement of an insensitive nucleus, like 13C, is required. The advantages and current limitations of the method, as well as future perspectives, are discussed.