2,4,6-halogeno-aniline derivatives

The title compounds, 2,4-dibromo-6-chloroaniline, C6H4Br2ClN, (1), N-acetyl-4-bromo-2,6-dichloroaniline (alternative name: 4'-bromo-2',6'-dichloroacetanilide). C8H6BrCl2NO, (2), and N-formyl-4-bromo-2,6-difluoroaniline [alternative name: N - (4-bromo-2,6-difluorophenyl)formamide], C7H4BrF2NO, (3), all have at least one short cell axis (in the range 4.2-4.7 Angstrom) and contain molecules which are linked to form infinite chains along the short-axis directions via N-H ... N or N-H ... O hydrogen bonds. Compound(1) has halogen disorder at the 2 and 6 positions.