data reports IUCrData (2017). 2, x162029 https://doi.org/10.1107/S2414314616020290 1 of 2 (E)-1-(1,3-Benzodioxol-5-yl)-3-[4-(dimethylamino)- phenyl]prop-2-en-1-one Karthik Kumara, a S. Naveen, b A. Dileep Kumar, c K. Ajay Kumar, c N. K. Lokanath a * and Ismail Warad d * a Department of Studies in Physics, University of Mysore, Manasagangotri, Mysuru 570 006, India, b Institution of Excellence, University of Mysore, Manasagangotri, Mysuru 570 006, India, c Department of Chemistry, Yuvaraja’s College, University of Mysore, Mysuru 570 005, India, and d Department of Chemistry, Science College, An-Najah National University, PO Box 7, Nablus, West Bank, Palestinian Territories. *Correspondence e-mail: lokanath@physics.uni-mysore.ac.in, khalil.i@najah.edu In the title compound, C 18 H 17 NO 3 , the olefinic double bond adopts an E conformation. The molecule is nearly planar as indicated by the dihedral angle of 3.11 (6)  between the benzodioxole and benzene rings. The carbonyl group lies in the plane of the olefinic double bond and the benzodioxole ring. The trans conformation of the C C double bond in the central enone group is confirmed by the C C—C—C torsion angle of 177.82 (14)  . Structure description Chalcones constitute the central core for the construction of a wide range of bioactive compounds (Ajay Kumar et al., 2010). Chalcones and their derivatives demonstrate a wide range of biological activities, such as antioxidant, antifungal, antibacterial, cardio- protective. In view of the broad spectrum of applications associated with chalcones and as a part of our ongoing work on such molecules (Tejkiran et al., 2016; Naveen et al., 2016a), we report herein on the synthesis and crystal structure of the title compound. The molecule (Fig. 1) is nearly planar, with a dihedral angle of 3.11 (6)  between the benzodioxole and benzene rings that are bridged by the olefinic double bond. This value is less than that reported for the dihedral angle between the aromatic rings [19.13 (15)  ] in the related chalcone derivative (E)-3-(2,3-dichlorophenyl)-1-(4-fluorophenyl)prop-2- en-1-one (Naveen et al., 2016b). The trans conformation about the C7 C8 double bond in the central enone group is confirmed by the C7 C8—C9—C10 torsion angle of 177.82 (14)  . The carbonyl group at C9 lies in the plane of the olefinic double bond and the benzodioxole ring, as indicated by the O3—C9—C8—C7 and O3—C9—C10—C16 Received 19 December 2016 Accepted 21 December 2016 Edited by O. Blacque, University of Zu ¨ rich, Switzerland Keywords: crystal structure; bis-chalcone; E conformation. CCDC reference: 1523974 Structural data: full structural data are available from iucrdata.iucr.org ISSN 2414-3146