6-[(2E)-3,7-Dimethyl­octa-2,6-dien-1-yl]-5,7-dihy­droxy-8-(2-methyl­butano­yl)-4-phenyl-2H-chromen-2-one–6-[(2E)-3,7-dimethyl­octa-2,6-dien-1-yl]-5,7-dihy­droxy-8-(3-methyl­butano­yl)-4-phenyl-2H-chromen-2-one (1/1) from Mesua elegans

• Main Authors: Awang, Khalijah, Chan, G., Ismail, N.H., Ng, Seik Weng, Tiekink, Edward R.T.
• Format: Article
• Language: English
• Published: International Union of Crystallography 2012
• Subjects: QD Chemistry
• Online Access: http://eprints.um.edu.my/10495/1/6.pdf; http://eprints.um.edu.my/10495/

The title co-crystal, C30H34O5·C30H34O5, comprises a 1:1 mixture of two mostly superimposed mol­ecules with the same chemical formula that differ in the nature of the substituent (2-methyl­butanoyl or 3-methyl­butano­yl) bound at the exocyclic ketone. The lactone ring is close to planar (r.m.s. deviation = 0.058 Å) and the phenyl ring is twisted out of this plane [dihedral angle = 60.08 (9)°]. The geranyl substituent is almost normal to benzene ring to which it is connected [C—C—Car—Car (ar = aromatic) torsion angle = −87.8 (2)°]. Intra­molecular O—H...O and O—H...π inter­actions are formed. In the crystal, supra­molecular chains are formed along the a axis owing to C—H...O contacts, with the lactone carbonyl atom accepting two such bonds.