Abstract
In the title compound, C21H16O2, the six crystallographically independent molecules (Z′ = 6) all exist in the enolized form. Strong intramolecular hydrogen bonds are observed: one approximate H-atom-centered O⋯H⋯O hydrogen bond, two tautomeric forms O—H⋯O (three molecules) and O⋯H—O (two molecules). Only one weak intermolecular C—H⋯O hydrogen bond between two neighboring molecules is observed in the crystal structure. In addition, eight very weak non-conventional intermolecular C—H⋯π hydrogen-bonding contacts between molecules are observed.
Highlights
C21H16O2, the six crystallographically independent molecules (Z0 = 6) all exist in the enolized form
One weak intermolecular C—HÁ Á ÁO hydrogen bond between two neighboring molecules is observed in the crystal structure
Symmetry codes: (i) x−1, y, z; (ii) x+1, y, z; (iii) −x, −y, −z+1; (iv) −x+1, −y, −z+1; (v) −x+1, −y+1, −z+1; (vi) −x+2, −y, −z+1
Summary
C21H16O2, the six crystallographically independent molecules (Z0 = 6) all exist in the enolized form. Strong intramolecular hydrogen bonds are observed: one approximate H-atom-centered OÁ Á ÁHÁ Á ÁO hydrogen bond, two tautomeric forms O—HÁ Á ÁO (three molecules) and OÁ Á ÁH—O (two molecules). One weak intermolecular C—HÁ Á ÁO hydrogen bond between two neighboring molecules is observed in the crystal structure. Eight very weak non-conventional intermolecular C—HÁ Á Á hydrogen-bonding contacts between molecules are observed. Related literature For proton transfer in solid 1-phenylbutane-1,3-dione and related 1,3-diones, see: Vila et al (1991). For the crystal structures of eight intramolecular hydrogen-bonded 1,3diaryl-1,3-propanedione enols, see: Bertolasi et al (1991). For electron transfer reactions of aromatic , -epoxy ketones, see: Hasegawa et al (1997). See: Desiraju & Steiner (2001)
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