Nuclear magnetic resonance signaling of molecular chiral information using an achiral reagent

Atsuomi Shundo, Jan Labuta, Jonathan P. Hill, Shinsuke Ishihara, Katsuhiko Ariga

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

(Figure Presented) Until now NMR spectroscopic detection of guest chirality using an achiral host has not been possible in the absence of a chiral medium or auxiliary since chiral discrimination is principally based on chiral discrimination by host and/or diastereomeric host-guest complex formation. In this paper, we demonstrate that an achiral oxoporphyrinogen works as a host capable of signaling chiral information of α-hydroxycarboxylic acids in 1H NMR spectroscopy. In particular, enantiomeric excess (ee) can be determined by observing the splitting of 1H NMR resonances of the achiral host. This differs from the case of chiral hosts (shift reagents) where % ee is generally determined from the ratio of peak areas due to diastereomeric host-guest complexes. UV/vis, CD, FT-IR, and NMR spectroscopic investigations suggest that the unusual phenomenon reported here is based on formation of a complex with 1:2 stoichiometry in concert with a protonation-driven tautomerization of the host.

Original languageEnglish
Pages (from-to)9494-9495
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number27
DOIs
Publication statusPublished - Jul 15 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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