Methyl (4-bromo-benzene-sulfonamido)acetate

(2R)-2-Benzene-sulfonamido-2-phenyl-ethanoic acid: a new monoclinic polymorph

In the title compound, C₁₄H₁₃NO₄S, a sulfonamide derivative of phenyl glycine, the aromatic rings are inclined at a dihedral angle of 28.03 (12)°. In the crystal, O—H⋯O hydrogen bonds link the molecules into chains propagating in [100] and a weak C—H⋯O interaction cross-links the chains in the c-axis direction. In the previously published polymorph, the dihedral angle between the aromatic rings is 45.52 (18)° and the structure is stabilized by three different types of ring motif.

2-(4-Bromobenzenesulfonamido)acetic acid

The title compound, C₈H₈BrNO₄S, a halogenated sulfon­amide, was prepared by basic hydrolysis of the methyl ester. In the crystal, mol­ecules form centrosymmetric hydrogen-bonded dimers via the carboxyl groups. These dimers are further linked by N—H⋯O inter­actions involving the carbonyl O and amide H atoms, forming a ribbon-like structure propagating in [010]. These ribbons are further linked via C—H⋯O inter­actions, forming a three-dimensional network.

2-Chloro-5-(2-iodo-benzene-sulfonamido)-benzoic acid

In the mol-ecule of the title compound, C(13)H(9)ClINO(4)S, the coordination around the S atom is distorted tetra-hedral. The aromatic rings are oriented at a dihedral angle of 74.46 (9)°. Intra-molecular C-H⋯O hydrogen bonds result in the formation of two five- and one six-membered rings, which adopt planar, envelope and twisted conformations, respectively. In the crystal structure, inter-molecular N-H⋯O and O-H⋯O hydrogen bonds link the mol-ecules to form R(2) (2)(8) ring motifs, which are further linked by C-H⋯O hydrogen bonds. π-π contacts between the benzene rings [centroid-centroid distances = 3.709 (3) and 3.772 (3) Å] may further stabilize the structure. The I atom is disordered over two positions, refined with occupancies of ca 0.75 and 0.25.

4-(2-Iodo-benzene-sulfonamido)benzoic acid monohydrate

In the mol­ecule of the title compound, C₁₃H₁₀INO₄S·H₂O, the coordination around the S atom is distorted tetra­hedral. The aromatic rings are oriented at a dihedral angle of 74.18 (17)°. Intra­molecular C—H⋯O hydrogen bonds result in the formation of non-planar five- and six-membered rings, which adopt envelope and twist conformations, respectively. In the crystal structure, inter­molecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules. π–π Contacts between the phenyl rings [centroid–centroid distance = 3.726 (3) Å] may further stabilize the structure. There is also a C—H⋯π inter­action.