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Abstract 5,10,15,20-Tetrakis(4-boronylphenyl)porphyrin (1) and 5,10,15,20-tetrakis[N-(2- or 4-boronylphenyl)methyl-pyridinium]porphyrin (o-2 or p-2) formed a 1:1 complex, which gave specific exciton-coupling bands in CD spectroscopy only in the presence of glucose and xylose among monosaccharides. The structural examination established that only these monosaccharides can bridge two porphyrins by covalent-bond formation with boronic acids and twist them asymmetrically.
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Arimori et al. (1996) studied this question.
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