Methyl (2Z)-2-bromo­methyl-3-(2,4-dichloro­phen­yl)prop-2-enoate

In the title compound C₁₁H₉BrCl₂O₂, which represents the Z isomer, the methyl­acrylate moiety is essentially planar within 0.039 (2) Å and has an extended trans configuration. The benzene ring makes a dihedral angle of 28.3 (1)° with the mean plane of the methyl­acrylate moiety. The crystal packing is characterized by C—H...O hydrogen bonding and halogen–halogen inter­actions [Cl...Cl = 3.486 (3) Å], resulting in the formation of R₂²(11) ring motifs and connecting the mol­ecules into chains propagating along the b axis.

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.