(E)-Methyl 3-(10-bromo-anthracen-9-yl)acrylate.

In the title mol-ecule, C18H13BrO2, the anthracene unit forms an angle of 46.91 (2)° with the mean plane of the methyl acrylate moiety. In the crystal, the mol-ecules arrange themselves into strands parallel to [010] and, due to the crystal symmetry, there are eight strands crossing the unit cell. In each strand, mol-ecules form short C-H⋯O and C-H⋯π contacts and have their anthracene groups parallel to each other. Neighboring strands, related by a c-glide operation, are connected via C-H⋯O inter-actions and form a layer parallel to (100). The arrangement of the acrylate and anthracene groups in the crystal do not allow for [2 + 2] or [4 + 4] cyclo-addition.

Ethyl (E)-3-(anthracen-9-yl)prop-2-enoate.

In the asymmetric unit of the title compound, C19H16O2, there are two symmetry-independent mol-ecules (A and B) that differ in the conformation of the ester eth-oxy group. In the crystal, the mol-ecules form inversion dimers via pairs of C-H⋯O inter-actions. Within the dimers, the anthracenyl units have inter-planar distances of 0.528 (2) and 0.479 (2) Šfor dimers of mol-ecules A and B, respectively. Another short C-H⋯O contact between symmetry-independent dimers links them into columns parallel to [10-1]. These columns are arranged into (111) layers and there are π-π stacking inter-actions [centroid-centroid distances = 3.6446 (15) and 3.6531 (15) Å] between the anthracenyl units from the neighbouring columns. In addition, there are C-H⋯π inter-actions between the anthracenyl unit of dimers A and dimers B within the same column.

2-propoxybenzamide.

In the title mol-ecule, C(10)H(13)NO(2), the amide -NH(2) group is oriented toward the prop-oxy substituent and an intra-molecular N-H⋯O hydrogen bond is formed between the N-H group and the prop-oxy O atom. The benzene ring forms dihedral angles of 12.41 (2) and 3.26 (2)° with the amide and prop-oxy group mean planes, respectively. In the crystal, N-H⋯O hydrogen bonds order pairs of mol-ecules with their mol-ecular planes parallel, but at an offset of 0.73 (2) Što each other. These pairs are ordered into two types of symmetry-related columns extended along the a axis with the mean plane of a pair in one column approximately parallel to (-122) and in the other to (-1-22). The two planes form dihedral angle of 84.40 (1)°. Overall, in a three-dimensional network, the hydrogen-bonded pairs of mol-ecules are either located in (-1-22) or (-122) layers. In one layer, each pair is involved in four C-H⋯O contacts, twice as a donor and twice as an acceptor. Additionally, there is a short C-H⋯C contact between a benzene C-H group and the amide π-system.

2-(Prop-2-enyloxy)benzamide.

In the title mol-ecule, C(10)H(11)NO(2), the benzene ring forms dihedral angles of 33.15 (2) and 6.20 (2)° with the mean planes of the amide and propen-oxy groups, respectively. The amide -NH(2) group is oriented toward the propen-oxy substituent and forms a weak intra-molecular N-H⋯O hydrogen bond to the propen-oxy O atom. The conformation of the propen-oxy group at the Csp(2)-Csp(3) and Csp(3)-O bonds is synperiplanar and anti-periplanar, respectively. In the crystal, N-H⋯O hydrogen bonds involving the amide groups generate C(4) and R(2) (3)(7) motifs that organize the mol-ecules into tapes along the a-axis direction. There are C-H⋯π inter-actions between the propen-oxy -CH(2) group and the aromatic system of neighboring mol-ecules within the tape. The mean planes of the aromatic ring and the propen-oxy group belonging to mol-ecules located on opposite sites of the tape form an angle of 83.16 (2)°.