Acta Cryst. (2009). C65, o326-o330 [ doi:10.1107/S0108270109019556 ]
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-stacked hydrogen-bonded chainsAbstract: In 6-(3,4,5-trimethoxyphenyl)-6,7-dihydro-5H-1,3-dioxolo[4,5-g]quinolin-8(5H)-one, C19H19NO6, (I), the six-membered heterocyclic ring adopts a conformation intermediate between envelope and half-chair forms; it is disordered over two enantiomeric configurations, with occupancies of 0.879 (3) and 0.121 (3), leading to positional disorder of the 3,4,5-trimethoxyphenyl unit. In 6-(1,3-benzodioxol-5-yl)-6,7-dihydro-5H-1,3-dioxolo[4,5-g]quinolin-8-one, C17H13NO5, (II), the molecules are similarly disordered, with occupancies of 0.866 (4) and 0.134 (4). The molecules in (I) are linked by one three-centre N-H
(O)2 hydrogen bond and one two-centre C-HO hydrogen bond to form a complex chain of rings whose formation is reinforced by two independent aromatic - stacking interactions. In (II), a single N-HO hydrogen bond links the molecules into a simple chain, and pairs of chains are linked by a single aromatic - stacking interaction.
Formula: C19H19NO6 and C17H13NO5
 |   Structure factor file (CIF format) (188.4 kbytes) |
| Structure factor file (CIF format) (151.1 kbytes) |
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