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From: | Herbert Chandler |
Subject: | [Francine-dev] sourly |
Date: | Thu, 5 Oct 2006 20:34:32 +0900 |
User-agent: | Thunderbird 1.5.0.7 (Windows/20060909) |
O hydrogen bonds link the molecules into chains extended along the b axis. O hydrogen bonds that form centrosymmetric dimers. There are two crystallographically independent molecules in the asymmetric unit. S intermolecular hydrogen bonds, forming a two-dimensional network. O hydrogen bonds, resulting in inversion-symmetry generated dimers. An intramolecular hydrogen bond links the NH group to an O atom of the nearest nitro group. The crystal structure is stabilized by short intermolecular Br. Both intra- and intermolecular hydrogen bonds are present between the hydroxyl groups, resulting in a one-dimensional hydrogen-bonding network. The trimethylsilyl group is substituted in the axial position of the half-chair. Both intra- and intermolecular hydrogen bonds are present between the hydroxyl groups, resulting in a one-dimensional hydrogen-bonding network. O hydrogen bonds, leading to zigzag chains along the b axis. The crystal packing is further stabilized by van der Waals forces. The crystal structure is stabilized by short intermolecular Br. O hydrogen bonds link molecules into one-dimensional chains along the b-axis direction. The crystal packing is further stabilized by van der Waals forces. The six-membered rings have chair conformations, while the conformation of the five-membered ring is an envelope. The structure comprises two molecules in the asymmetric unit, which differ in terms of the orientation of their pendant n-propyl groups. O hydrogen bonds stabilize the structure. N hydrogen bonds into linear chains. The trimethylsilyl group is substituted in the axial position of the half-chair. Geometric parameters are in the normal ranges. Geometric parameters are in normal ranges. O short-contact interactions. O hydrogen bonds link the molecules into chains running along the a axis. O hydrogen bond forms a six-membered ring. As a result of the synthetic precursor being enantiomerically pure, only the R,R enantiomer occurs in the structure. O hydrogen bonds into a three-dimensional network. The crystal structure is stabilized by short intermolecular Br. An intramolecular hydrogen bond links the NH group to an O atom of the nearest nitro group. The bond lengths within the system indicate some degree of delocalization. As a result of the synthetic precursor being enantiomerically pure, only the R,R enantiomer occurs in the structure. The crystal structure is stabilized by short intermolecular Br. O hydrogen bonding between the two independent molecules comprising the asymmetric unit involving the carbonyl O atoms; this extends to link neighboring molecules into a chain. The chains are further stabilized in ribbons by Cl. Both intra- and intermolecular hydrogen bonds are present between the hydroxyl groups, resulting in a one-dimensional hydrogen-bonding network. N hydrogen-bonding interactions. |
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