Abstract
Four disulphonyl carbon
acids, (PhCH2SO2)2CHY (Y = H, Ph,p-CNC6H4,p-
NO2C6H4), have been synthesized and their
ionization constants determined by spectrophotometric measurements in 80% (w/w)
dimethyl sulphoxide- water at 25�C. The pKa values, ranging from 11.65�0.02
to 7.75�0.02, present strong evidence for the conjugative effect of the two
sulphonyl groups attached to the carbon acids.
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