Azophenolic crown ethers 9 and 10 of Cs symmetry incorporating cis-1-phenylcyclohexane-1,2-diol residues as a steric barrier have been prepared; they bind ethanolamine stereoselectively to one of their diastereotopic faces.
K. Naemura, S. Takeuchi, M. Asada, K. Hirose, Y. Tobe, T. Kaneda and Y. Sakata, J. Chem. Soc., Chem. Commun., 1994, 711 DOI: 10.1039/C39940000711
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