Substituent effects of theN,N-dimethyl- sulfamoyl group on the1H and13C NMR spectra of positional isomers of quinolines
作者:Andrzej Maślankiewicz、Maria J. Maślankiewicz、Krzysztof Marciniec
DOI:10.1002/mrc.2150
日期:2008.2
The complete 1H and 13C NMR spectral assignments of seven positional isomers of N,N‐dimethylsulfamoylquinolines 2–8 and quinoline have been made using 1D and 2D NMR techniques, including COSY, HMQC and HMBC experiments. ΔδH and ΔδC substituenteffects induced by the sulfamoyl group were determined. The sulfamoyl substituent affects proton and carbon chemical shifts both in the parent and in the fused
Ionization constants of all seven positional isomers of quinolinesulfonamides and quinoline-N,N-dimethylsulfonamides
作者:Maria J. Maślankiewicz、Krzysztof Marciniec、Andrzej Maślankiewicz、Maria Jaworska
DOI:10.1016/j.molstruc.2012.10.024
日期:2013.2
isomeric sulfamoylquinolines 2a–8a and N,N-dimethylsulfamoylquinolines 2b–8b were determined by means of a UV–VIS spectroscopic method that uses absorbance diagrams, at constant ionic strength (0.15 M). For sulfamoylquinolines 2a–8a two pKa values – for basic function (Nring: −0.31 to 3.36) and for acid function (SO2NH2 group: 8.89–10.34) but only one in the case of N,N-dimethylsulfamoylquinolines 2b–8b