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Updated: Sep 27, 2026

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Derivatization, complexation, and absolute configurational assignment of chiral primary amines: application of
Jing Zhang1, Andrea E Holmes, Akanksha Sharma
1Department of Chemistry, New York University, New York, NY 10003, USA.
Abstract:
We report here a sensitive method for the determination of the absolute configurations of primary amines using exciton-coupled circular dichroism (ECCD). The method works on a microgram scale by derivatization of chiral amines with quinoline chromophores. Complexation of the chiral ligands with metal ion fixes the geometry of the chromophores, resulting in a twist that is governed by the asymmetric carbon configuration and steric environment of the amine. The absolute configurations of the primary amines can be interpreted from the couplets of the ECCD spectra of the derivatized complexes. Crystal structures, 2D NMR studies, and semiempirical calculations provide structural evidence for our model.
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