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7,7',8,8'-Tetra-meth-oxy-4,4'-dimethyl-3,5'-bichromene-2,2'-dione.

ABSTRACT: In the title mol-ecule, C(24)H(22)O(8), the mean planes of the two coumarin units are inclined to each other at a dihedral angle of 79.93?(3)°. The attached meth-oxy groups form torsion angles of 7.65?(19) and 78.36?(14)° with respect to one coumarin unit, and angles of 9.01?(16) and 99.08?(11)° with respect to the other coumarin unit. In the crystal structure, weak inter-molecular C-H?O hydrogen bonds connect pairs of mol-ecules to form dimers, generating R(2) (2)(16) and R(2) (2)(18) rings; the dimers are linked by further weak inter-molecular C-H?O hydrogen bonds, forming extended chains. Additional stabil-ization is provided by weak C-H?? inter-actions.

SUBMITTER: Fun HK 

PROVIDER: S-EPMC2969715 | biostudies-other | 2009

REPOSITORIES: biostudies-other

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7,7',8,8'-Tetra-meth-oxy-4,4'-dimethyl-3,5'-bichromene-2,2'-dione.

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 20090520 Pt 6

In the title mol-ecule, C(24)H(22)O(8), the mean planes of the two coumarin units are inclined to each other at a dihedral angle of 79.93 (3)°. The attached meth-oxy groups form torsion angles of 7.65 (19) and 78.36 (14)° with respect to one coumarin unit, and angles of 9.01 (16) and 99.08 (11)° with respect to the other coumarin unit. In the crystal structure, weak inter-molecular C-H⋯O hydrogen bonds connect pairs of mol-ecules to form dimers, generating R(2) (2)(16) and R(2) (2)(18) rings; th  ...[more]

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