Abstract
The structures of aromatic sulfonamide molecules XPhSO2NH2 (X = H, 4-Me, 4-F, 4-Cl, 4-Br, 4-MeO, 4-OH, 4-NH2, 4-CN, 3-NO2, 4-NO2, 3,5-(NO2)2, 3,4-Cl2, 3-Cl-4-Me, 3,4-Me2, 3-Me-4-F, 2-Me) were calculated at the M06/6-311++G** (SMD) level of theory. The atomic electrostatic potentials (AEP) and the Hirshfeld charges of the sulfonamide nitrogen atoms were determined. Correlation equations relating the AEP to Bronsted acidities (pKa) of these compounds were obtained using published data and the previously unknown pKa values for a number of arylsulfonamides were calculated. These pKa values are consistent with independently determined free energies of acid dissociation of sulfonamides.
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Based on the materials of the V All-Russian Organic Chemistry Conference (ROCC-V) (September 10–14, 2018, Vladikavkaz, Russia).
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Krylov, E.N., Virzum, L.V. Acidity of arylsulfonamides as function of quantum chemical parameters of sulfonamide nitrogen. Russ Chem Bull 68, 527–531 (2019). https://doi.org/10.1007/s11172-019-2449-8
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DOI: https://doi.org/10.1007/s11172-019-2449-8