Shi-jie Zhang, Hai Xiang, Guo-Wu Rao
Sep 17, 2013
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Journal
Journal of Structural Chemistry
Abstract
Two 4-phenylbenzophenones (I) and (II) are synthesized via Friedel-Crafts reactions. There are four crystallographically independent molecules with different conformations in the crystal structure of [1,1′-biphenyl]-4-yl(2-chlorophenyl)methanone (I). Crystals are orthorhombic, Pca21, C19H13ClO, a = 13.699(3) Å, b = 8.9385(17) Å, c = 46.836(9) Å; V = 5735(2) Å3, Z = 16, dx = 1.356 g/cm3. Torsion angles between the biphenyl rings are between 28.5° and 30.8°. Several C-H…O and C-H…Cl hydrogen bonds and weak π-π stacking contacts consolidate the crystal. Crystals of [1,1′-biphenyl]-4-yl(3-methoxyphenyl)methanone (II) are orthorhombic, Pbca, C20H16O2, a = 7.8179(15) Å, b = 16.003(3) Å, c = 23.345(5) Å; V = 2920.7(10) Å3, Z = 8, dx = 1.311 g/cm3. The torsion angle between the biphenyl rings is 28.1° and C-H…O hydrogen bonds are observed in compound (II).