The effects of aromatic substituents on the chromatographic enantioseparation of diarylmethyl esters with the whelk-O1 chiral stationary phase

J Chromatogr A. 2004 Nov 5;1055(1-2):41-53. doi: 10.1016/j.chroma.2004.08.001.

Abstract

Members of a series of diarylmethanols, diarylmethyl pivalates, and diarylmethyl acetates (analyte sets 1-26) were enantioresolved with the (S,S)-Whelk-O1 chiral stationary phase (CSP). An analogue of the (S,S)-Whelk-O1 selector was combined with enantioenriched samples of the various diarylmethyl pivalates and thereby used as a chiral solvating agent (CSA) for high field 1H NMR studies. The absolute configurations of a number of chiral diarylmethyl pivalates were assigned using this approach, and hydrolysis of the pivalates allowed assignment of the absolute configurations of the corresponding diarylmethanols. Chromatographic, 1H NMR, and X-ray evidence are given in support of a chiral recognition model for the enantioresolution of diarylmethyl esters on this CSP.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Chromatography, High Pressure Liquid / instrumentation*
  • Esters / chemistry*
  • Magnetic Resonance Spectroscopy
  • Stereoisomerism

Substances

  • Esters