Phenolic crown ethers (S,S)-1, (R,R)-2, (S,S)-3 and (S,S)-4 were prepared in enantiomerically pure forms; the enantiomer selectivities of crown ethers (S,S)-1 and (R,R)-2 in complexation with 2-aminopropan-1-ol reversed at ca. 6 °C and increased with increasing temperature above the isoenantioselective temperature.
K. Naemura, J. Fuji, K. Ogasahara, K. Hirose and Y. Tobe, Chem. Commun., 1996, 2749 DOI: 10.1039/CC9960002749
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