Acta Cryst. (2011). E67, o935  [ doi:10.1107/S1600536811009639 ]

4-Chloro-2',4',6'-triethylbenzophenone: a redetermination

H. Takahashi

Abstract: The structure of the title compound [systematic name: (4-chlorophenyl)(2,4,6-trimethylphenyl)methanone], C₁₉H₂₁ClO, has been redetermined at 100 K. The redetermination is of significantly higher precision than the previous structure determination at 133 K and reveals disorder of the one of the o-ethyl groups [occupancy factors = 0.77 (1) and 0.23 (1)] that was not identified in the previous report [Takahashi & Ito (2010). CrystEngComm, 12, 1628-1634]. The C-C-C-C torsion angles of the major and minor disorder components of the ethyl group with respect to the attached benzene ring are -103.7 (2) and -172.0 (6)°, respectively. It is of interest that the title compound does not display a single-crystal-to-single-crystal polymorphic phase transition on cooling, as was observed for a closely related compound, a fact that can be attributed to the disorder in the ethyl group.

Online 19 March 2011

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