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7,7',8,8'-Tetra-meth-oxy-4,4'-dimethyl-3,3'-bicoumarin.

ABSTRACT: In the crystal structure, the title compound, C(24)H(22)O(8), lies on a twofold rotation axis and the asymmetric unit comprises one half-mol-ecule. The dihedral angle formed by the coumarin unit with the symmetry-related part is 74.78?(14)°. One of the meth-oxy groups attached to the coumarin unit is considerably twisted, making an angle of 87.17?(17)° with respect to the coumarin unit; the other is twisted by 0.66?(19)°. No classical hydrogen bonds are found in the sturcture; only a weak C-H?? inter-action and short intra-molecular O?O contacts [2.683?(2)-2.701?(2)?Å] are observed.

SUBMITTER: Fun HK 

PROVIDER: S-EPMC2969639 | biostudies-literature | 2009 May

REPOSITORIES: biostudies-literature

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7,7',8,8'-Tetra-meth-oxy-4,4'-dimethyl-3,3'-bicoumarin.

Fun Hoong-Kun HK   Jebas Samuel Robinson SR   Parveen Mehtab M   Khanam Zakia Z   Ghalib Raza Murad RM  

Acta crystallographica. Section E, Structure reports online 20090514 Pt 6

In the crystal structure, the title compound, C(24)H(22)O(8), lies on a twofold rotation axis and the asymmetric unit comprises one half-mol-ecule. The dihedral angle formed by the coumarin unit with the symmetry-related part is 74.78 (14)°. One of the meth-oxy groups attached to the coumarin unit is considerably twisted, making an angle of 87.17 (17)° with respect to the coumarin unit; the other is twisted by 0.66 (19)°. No classical hydrogen bonds are found in the sturcture; only a weak C-H⋯π  ...[more]

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