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1. 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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2. Crystal structure of tert -butyl 3,6-diiodocarbazole-9-carboxylate

   https://doi.org/10.1107/S205698902300230X  

   Sielaff, Elizabeth N.; Staples, Richard J.; Biros, Shannon M. (April 2023, Acta Crystallographica Section E Crystallographic Communications)

   The molecular structure of tert -butyl 3,6-diiodocarbazole-9-carboxylate, C 17 H 15 I 2 NO 2 , features a nearly planar 13-membered carbazole ring with C—I bond lengths of 2.092 (4) and 2.104 (4) Å. The carbamate group has key bond lengths of 1.404 (6) Å (N—C), 1.330 (5) Å (O—C), and 1.201 (6) Å (C=O). The crystal contains intermolecular π–π interactions, as well as both type I and type II intermolecular I...I interactions. 

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3. 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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4. 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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5. Syntheses and crystal structures of the anhydride 4-oxatetracyclo[5.3.2.0 ^2,6 .0 ^8,10 ]dodec-11-ene-3,5-dione and the related imide 4-(4-bromophenyl)-4-azatetracyclo[5.3.2.0 ^2,6 .0 ^8,10 ]dodec-11-ene-3,5-dione

   https://doi.org/10.1107/S2056989020009512  

   Hulsman, Andrew; Lorenzana, Isabel; Schultz, Theodore; Squires, Breezy; Stenfors, Brock A.; Tolonen, Mason; Staples, Richard J.; Biros, Shannon M.; Winchester, William R. (August 2020, Acta Crystallographica Section E Crystallographic Communications)

   null (Ed.)

   The syntheses and crystal structures of the two title compounds, C 11 H 10 O 3 ( I ) and C 17 H 14 BrNO 2 ( II ), both containing the bicyclo[2.2.2]octene ring system, are reported here [the structure of I has been reported previously: White & Goh (2014). Private Communication (refcode HOKRIK). CCDC, Cambridge, England]. The bond lengths and angles of the bicyclo[2.2.2]octene ring system are similar for both structures. The imide functional group of II features carbonyl C=O bond lengths of 1.209 (2) and 1.210 (2) Å, with C—N bond lengths of 1.393 (2) and 1.397 (2) Å. The five-membered imide ring is nearly planar, and it is positioned exo relative to the alkene bridgehead carbon atoms of the bicyclo[2.2.2]octene ring system. Non-covalent interactions present in the crystal structure of II include a number of C—H...O interactions. The extended structure of II also features C—H...O hydrogen bonds as well as C—H...π and lone pair–π interactions, which combine together to create supramolecular sheets. 

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