~1H and ~13C NMR spectral study of substituent effects in 4-substituted 2',6'-dimethyldiphenyl sulphones

摘要

The proton and carbon-13 spectra of seven 4-substituted 2'-6'-dimethyldiphenyl sulphones (series 1) have been measured in CDCI_3. Assignments of chemical shifts and correlations with benzene substituent induced chemical shifts, Hammett substituent parameters and dual substituent parameters (DSP) have been made. Comparison of the correlation results of series 1 with those of 4-and-2-substituted diphenyl sulphones reveals that the increase in steric congestion in the proximity of the sulphonyl group in the title series does not have significant influence ont eh extent of transmission of substituent effects.