title: 4-Chloro-2',4',6'-triethyl-benzophenone: a redetermination.
abstract: THE STRUCTURE OF THE TITLE COMPOUND [SYSTEMATIC NAME: (4-chloro-phen-yl)(2,4,6-trimethyl-phen-yl)methanone], C(19)H(21)ClO, 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 inter-est 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.
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takahashi