Download citation
Download citation

link to html
In the title compound, C17H15NO4, the conformation about the C=C double bond [1.348 (2) Å] is E with the ketone group almost co-planar [C—C—C—C torsion angle = 7.2 (2)°] but the phenyl group twisted away [C—C—C—C = 160.93 (17)°]. The terminal aromatic rings are almost perpendicular to each other [dihedral angle = 81.61 (9)°] giving the mol­ecule an overall U-shape. The crystal packing feature benzene-C—H...O(ketone) contacts that lead to supra­molecular helical chains along the b axis. These are connected by π–π inter­actions between benzene and phenyl rings [inter-centroid distance = 3.6648 (14) Å], resulting in the formation of a supra­molecular layer in the bc plane.

Download citation
Download citation

link to html
In the title compound, C15H20BrNO2, there are two independent mol­ecules (A and B) comprising the asymmetric unit and these adopt very similar conformations. In A, the dihedral angle between the CO2 and MeC=CMe2 groups is 80.7 (3)°, and these make dihedral angles of 3.5 (3) and 84.09 (16)°, respectively, with the bromo­benzene ring. The equivalent dihedral angles for mol­ecule B are 78.4 (3), 2.1 (3) and 78.37 (12)°, respectively. The most prominent inter­actions in the crystal packing are amine-N—H...O(carbon­yl) hydrogen bonds between the two independent mol­ecules, resulting in non-centrosymmetric ten-membered {...OC2NH}2 synthons. Statistical disorder is noted for each of the terminal methyl groups of the ethyl residues.
Follow Acta Cryst. E
Sign up for e-alerts
Follow Acta Cryst. on Twitter
Follow us on facebook
Sign up for RSS feeds