Received 18 March 2013
The asymmetric unit of the title compound, C23H18O3, contains two independent molecules (A and B). Each molecule has essentially the same conformation (r.m.s. deviation of fitted molecules = 0.173 Å) with the aromatic rings twisted in a near perpendicular manner. The dihedral angles between the two naphthalene ring systems are 79.07 (4) and 88.19 (4)° in the two independent molecules. In the crystal, the A molecules are connected by C-HO interactions, forming chains along the b-axis direction. Further C-HO interactions between the H atoms of the methoxy group and the O atoms of the carbonyl units link the A and B molecules, forming a three-dimensional network.
For electrophilic aroylation of naphthalene derivatives, see: Okamoto & Yonezawa (2009); Okamoto et al. (2011). For the structures of closely related compounds, see: Nakaema et al. (2008); Kato et al. (2010); Tsumuki et al. (2012, 2013); Sasagawa et al. (2013).
Data collection: PROCESS-AUTO (Rigaku, 1998); cell refinement: PROCESS-AUTO; data reduction: PROCESS-AUTO; program(s) used to solve structure: Il Milione (Burla et al., 2007); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPIII (Burnett & Johnson, 1996); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: VM2191 ).
The authors express their gratitude to Professor Keiichi Noguchi, Instrumentation Analysis Center, Tokyo University of Agriculture & Technology, for technical advice. This work was partially supported by an Iron and Steel Institute of Japan (ISIJ) Research Promotion Grant.
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