Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 4 (April 2013)

organic compounds

Acta Cryst. (2013). E69, o530    [ doi:10.1107/S1600536813005229 ]

(2E,5E)-2,5-Bis(4-hy­droxy-3-meth­oxy­benzyl­idene)cyclo­penta­none ethanol monosolvate

M. Da'i, A. Yanuar, E. Meiyanto, U. A. Jenie and A. M. Supardjan

Abstract: In the title structure, C21H20O5·C2H5OH, the curcumine-type mol­ecule has a double E conformation for the two benzyl­idene double bonds [C=C = 1.342 (4) and 1.349 (4) Å] and is nearly planar with respect to the non-H atoms (r.m.s. deviation from planarity = 0.069 Å). The two phenolic OH groups form bifurcated hydrogen bonds with intra­molecular branches to adjacent meth­oxy O atoms and inter­molecular branches to either a neighbouring mol­ecule or an ethanol solvent mol­ecule. The ethanol O atom donates a hydrogen bond to the keto O atom. These hydrogen bonds link the constituents into layers parallel to (101) in the crystal structure.

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