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7,7'-Dihy-droxy-4,4'-dimethyl-3,4-dihydro-2H,2'H-4,6'-bichromene-2,2'-dione.

ABSTRACT: The title compound, C(20)H(16)O(6), which contains one chiral centre, crystallizes as a racemate. The mean planes of the two coumarin units make a dihedral angle of 88.07?(2)°. The pyrone ring containing the chiral centre adopts a sofa conformation. In the crystal, four mol-ecules are linked by O-H?O hydrogen bonds, forming a tetrameric ring with graph-set motif R(4) (4)(32). These tetramers are further linked by O-H?O hydrogen bonds into a three-dimensional network.

SUBMITTER: Pereira Silva PS 

PROVIDER: S-EPMC3050332 | biostudies-literature | 2010 Dec

REPOSITORIES: biostudies-literature

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7,7'-Dihy-droxy-4,4'-dimethyl-3,4-dihydro-2H,2'H-4,6'-bichromene-2,2'-dione.

Pereira Silva P S PS   Parveen Mehtab M   Ali Akhtar A   Malla Ali Mohammed AM   Ramos Silva M M  

Acta crystallographica. Section E, Structure reports online 20101218 Pt 1

The title compound, C(20)H(16)O(6), which contains one chiral centre, crystallizes as a racemate. The mean planes of the two coumarin units make a dihedral angle of 88.07 (2)°. The pyrone ring containing the chiral centre adopts a sofa conformation. In the crystal, four mol-ecules are linked by O-H⋯O hydrogen bonds, forming a tetrameric ring with graph-set motif R(4) (4)(32). These tetramers are further linked by O-H⋯O hydrogen bonds into a three-dimensional network. ...[more]

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