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Acta Crystallogr Sect E Struct Rep Online. 2008 Apr 23;64(Pt 5):o893. doi: 10.1107/S1600536808010672.

7-Eth-oxy-4'-methoxy-isoflavone (monoethyl-formononetin).

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Department of Chemistry and Chemical Engineering, Weinan Teachers University, weinan 714000, People's Republic of China.


The title compound, C(18)H(16)O(4), is composed of a benzopyran-one core with a 4-methoxy-phenyl subsituent in the 3-position and an additional eth-oxy group in the 7-position. The benzopyran-one ring is not coplanar with the benzene ring, the dihedral angle between them being 41.76 (7)°. The meth-oxy and eth-oxy substituents are nearly coplanar with the ring systems to which they are attached. Individual mol-ecules are linked by two kinds of inter-molecular hydrogen bonds into chains containing classical R(2) (2)(8) rings. The chains are further assembled by aromatic F-tape and T-tape stacking inter-actions and additional inter-molecular hydrogen bonding to give a two-dimensional network.

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