
%0 Journal Article
%A Farrell, JR 
%A Mctigue, P 
%T The Basicity of 2,6-Dimethyl-4-pyrone
%J Australian Journal of Chemistry
%D 1985/06/01
%V 38
%N 6
%P 985-989
%K 
%R https://doi.org/10.1071/CH9850985
%U https://www.publish.csiro.au/paper/CH9850985 
%X Conductimetric and spectrophotometric measurements of the Ka of protonated 2,6-dimethyl-4-pyrone have been made. The conductimetrically determined value of pKa = 0.17±0.03 was 0.2 pK units higher than the value of pKa = -0.02±0.05 found spectrophotometrically . The spectrophotometric studies in concentrated sulfuric and hydrochloric acids revealed that, at low acid concentrations, the pyrone had an excess acidity slope parameter (m&#8225;) of -0.29. However, over a large acid concentration range, m&#8225; was observed to vary in a way that caused moderate systematic errors in the excess acidity extrapolation procedure. For this reason the conductimetric value is considered more reliable. 
