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Several ω-CF 3 -substituted α-amino acids have been prepared in optically pure form via two complementary approaches. Racemic fluorinated derivatives of 2-aminobutanoic acid, norvaline and norleucine were chemically deracemized by complexation with a Ni(II) salt and a chiral reagent derived from α-(phenyl)ethylamine. Additionally this procedure also allowed the conversion of readily available...
This work demonstrates that self‐disproportionation of enantiomers via achiral chromatography can be recommended as inexpensive and general method for optical purifica‐ tion of enantiomerically enriched compounds. In particular, the advantage of this approach over conventional recrystallization is that it can be used for both crystalline as well as liquid com‐ pounds. Chirality, 25:365–368, 2013....
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