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1. Crystal structure of N -allyl-4-methylbenzenesulfonamide

   https://doi.org/10.1107/S2056989018010290  

   Patel, Zeel S.; Stevens, Amanda C.; Bookout, Erin C.; Staples, Richard J.; Biros, Shannon M.; Ngassa, Felix N. (August 2018, Acta Crystallographica Section E Crystallographic Communications)

   The title compound, C 10 H 13 NO 2 S, was synthesized by a nucleophilic substitution reaction between allyl amine and p -toluenesulfonyl chloride. The sulfonate S—O bond lengths are 1.4282 (17) and 1.4353 (17) Å, and the C—N—S—C torsion angle involving the sulfonamide moiety is −61.0 (2)°. In the crystal, centrosymmetric dimers of the title compound are present via intermolecular N—H...O hydrogen bonds between sulfonamide groups. These dimers are linked into ribbons along the c -axis direction through offset π–π interactions. 

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2. 1,1′-Methylenebis{4-[( E )-2-(pyridin-4-yl)ethenyl]pyridinium} dibromide dihydrate

   https://doi.org/10.1107/S2414314622005259  

   Neal, Henry C.; Nesterov, Volodymyr V.; Smucker, Bradley W. (May 2022, IUCrData)

   The chevron-shaped cations of the title hydrated salt, C 25 H 22 N 4 2+ ·2Br − ·2H 2 O, are arranged in back-to-back alternating directions to form a zigzag ribbon propagating along the [010] direction. Intermolecular interactions comprising these ribbons are π–π interactions between the pyridinium and adjacent pyridyl rings, as well as O—H...O hydrogen bonding between water molecules and two adjacent pyridyl N atoms. Half of the cation is generated by the mirror plane. The water O atoms, the central C atom and one Br atom are located on this mirror plane while the other Br atom is on a twofold screw axis. 

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3. Crystal structure of N , N -diisopropyl-4-methylbenzenesulfonamide

   https://doi.org/10.1107/S2056989020007185  

   Stenfors, Brock A.; Staples, Richard J.; Biros, Shannon M.; Ngassa, Felix N. (July 2020, Acta Crystallographica Section E Crystallographic Communications)

   The synthesis of the title compound, C 13 H 21 NO 2 S, is reported here along with its crystal structure. This compound crystallizes with two molecules in the asymmetric unit. The sulfonamide functional group of this structure features S=O bond lengths ranging from 1.433 (3) to 1.439 (3) Å, S—C bond lengths of 1.777 (3) and 1.773 (4) Å, and S—N bond lengths of 1.622 (3) and 1.624 (3) Å. When viewing the molecules down the S—N bond, the isopropyl groups are gauche to the aromatic ring. On each molecule, two methyl hydrogen atoms of one isopropyl group are engaged in intramolecular C—H...O hydrogen bonds with a nearby sulfonamide oxygen atom. Intermolecular C—H...O hydrogen bonds and C—H...π interactions link molecules of the title compound in the solid state. 

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4. N -(5-Cyanononan-5-yl)benzamide

   https://doi.org/10.1107/S2414314623006399  

   Song, Xueqing; Li, William (July 2023, IUCrData)

   N -(5-Cyanononan-5-yl)benzamide, C 17 H 24 N 2 O, synthesized from the reaction between benzoyl chloride and 2-amino-2-butylhexanenitrile, is an important intermediate in amino acid synthesis. Intermolecular N—H...O and C—H...O hydrogen bonds with N...O and C...O distances of 3.083 (2) and 3.304 (2) Å, respectively, link adjacent molecules into chains along the a axis. The dihedral angle between the mean plane of the phenyl group and the plane of the amide group is 19.504 (4)°. 

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5. Crystal structure of 4-methyl- N -propylbenzenesulfonamide

   https://doi.org/10.1107/S2056989020007756  

   Stenfors, Brock A.; Collins, Rachel C.; Duran, Jonah R.; Staples, Richard J.; Biros, Shannon M.; Ngassa, Felix N. (July 2020, Acta Crystallographica Section E Crystallographic Communications)

   The crystal structure of the title sulfonamide, C 10 H 15 NO 2 S, comprises two molecules in the asymmetric unit. The S=O bond lengths of the sulfonamide functional group range from 1.428 (2) to 1.441 (2) Å, with S—C bond lengths of 1.766 (3) Å (for both molecules in the asymmetric unit), and S—N bond lengths of 1.618 (2) and 1.622 (3) Å, respectively. When both molecules are viewed down the N—S bond, the propyl group is gauche to the toluene moiety. In the crystal structure, molecules of the title compound are arranged in an intricate three-dimensional network that is formed via intermolecular C—H...O and N—H...O hydrogen bonds. The crystal structure was refined from a crystal twinned by inversion. 

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