7,7 '-Dihydroxy-4,4 '-dimethyl-3,4-dihydro-2H,2 ' H-4,6 '-bichromene-2,2 '-dione

作者：Silva P S Pereira; Parveen Mehtab; Ali Akhtar; Malla Ali Mohammed; Silva M Ramos^*

来源：Acta Crystallographica Section E-Structure Reports Online, 2011, 67: O201-U3136.

DOI：10.1107/S160053681005244X

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)degrees. The pyrone ring containing the chiral centre adopts a sofa conformation. In the crystal, four molecules are linked by O-H center dot center dot center dot O hydrogen bonds, forming a tetrameric ring with graph-set motif R(4)(4) (32). These tetramers are further linked by O-H center dot center dot center dot O hydrogen bonds into a three-dimensional network.

• 出版日期2011-1