title: Ethyl (E)-2-cyano-3-(4-methyl-phen-yl)acrylate: a second monoclinic polymorph.
abstract: The title compound, C13H13NO2, was previously described in space group P21/c by He et al. [Acta Cryst. (1993), C49, 2000-2002]. The ethyl group is disordered over two sets of sites in a 0.615 (10):0.385 (10) ratio. The C-O-C-C torsion angles containing the ethyl group are -111.6 (10) and 177.9 (7)°, while in the previously reported polymorph, the torsion angle is -167.3 (2)°. The molecules pack to form a three-dimensional structure in the ABAB style along the c-axis direction in the title compound, but parallel to the a-axis direction in the reported polymorph.
authors.affiliation: Deparment of Chemistry, Anhui University, Hefei 230039, People's Republic of China ; Key Laboratory of Functional Inorganic Materials, Chemistry, Hefei 230039, People's Republic of China.
authors.forename: Qi-Yu
authors.initials: QY
authors.lastname: Chen
authors.forename: Wen-Dong
authors.initials: WD
authors.lastname: Ke
authors.forename: Lin
authors.initials: L
authors.lastname: Kong