Methyl (2Z)-2-bromo­meth­yl-3-(3-chloro­phen­yl)prop-2-enoate

There are two independent mol­ecules (A and B) in the asymmetric unit of the title compound C₁₁H₁₀BrClO₂, which represents the Z isomer. The methyl­acrylate moieties are essentially planar, within 0.084 (2) and 0.027 (5) Å in mol­ecules A and B, respectively. The benzene ring makes dihedral angles of 13.17 (7) and 27.89 (9)° with the methyl­acrylate moiety in mol­ecules A and B, respectively. The methyl­bromide moiety is almost orthogonal to the benzene ring, making dihedral angles of 81.46 (16)° in mol­ecule A and 79.61 (16)° in mol­ecule B. The methyl­acrylate moiety exhibits an extended trans conformation in both mol­ecules. In the crystal, pairs of C—H...O hydrogen bonds result in the formation of quasi-centrosymmetric R₂²(14) AB dimers.

4-(4-Bromo­phen­yl)-2-methyl­amino-3-nitro-5,6,7,8-tetra­hydro-4H-chromen-5-one

In the title compound, C₁₆H₁₅BrN₂O₄, the six-membered carbocyclic ring of the chromene moiety adopts an envelope conformation with the disordered methyl­ene C atom as the flap. The pyran ring is almost orthogonal to the chloro­phenyl ring, making a dihedral angle of 87.11 (12)°. The amine-group N atom deviates significantly from the pyran ring [0.238 (3) Å]. The mol­ecular structure is stabilized by an intra­molecular N—H...O hydrogen bond, which generates an S(6) ring motif. In the crystal, mol­ecules are linked via C—H...O hydrogen bonds, which generate C(8) chains running parallel to the b axis. The chains are linked by C—H...π inter­actions. The methyl­ene-group C atom of the chromene system that is disordered, along with its attached H atoms and the H atoms on the two adjacent C atoms, has an occupancy ratio of 0.791 (7):0.209 (7).