Supramolecular isomerism in the hydrogen-bonded network of (5<Emphasis Type="Italic">R</Emphasis>,10<Emphasis Type="Italic">R</Emphasis>)-3,8-dihydroxy-5,10-diethoxy-5,10-dihydrochromeno[5,4,3-<Emphasis Type="Italic">cde</Emphasis>]chromene monohydrate |
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Authors: | Jian-Zhong Wu Long Lin Ying Yu Xia Wan Xia Yin |
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Institution: | (1) Department of Chemistry, South China Normal University, Guangzhou, 510631, China |
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Abstract: | A new compound (5R, 10R)-3,8-dihydroxy-5,10-diethoxy-5,10-dihydrochromeno5,4,3-cde]chromene monohydrate was obtained from 3,4-dihydroxybenzaldehyde in aerobic basic aqueous ethanol solution in the presence
of manganese chloride and triethylamine and crystallized in orthorhombic P212121 space group (denoted as 1). When 1 was recrystallized from aqueous methanol, it was transformed to another crystal (2) with the same composition but in P21/n space group. The drastic difference in the extensive hydrogen bond network makes 1 a 3D and 2 a 2D infinite supramolecular structure, respectively. |
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Keywords: | (5R 10R)-3 8-dihydroxy-5 10-diethox-5 10-dihydrochromeno[5 4 3-cde]chromene Crystal structure Hydrogen bond Supramolecular isomerism |
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