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- [3] Preparation of optically active azophenolic crown ethers containing 1-phenylethane-1,2-diol and 2,4-dimethyl-3-oxapentane-1,5-diol as a chiral subunit: temperature-dependent enantiomer selectivity in the complexation with chiral amines JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1997, (21): : 3227 - 3236