Thermochemical data acidity function

Despite the interest in, and importance of, sulphonic acids and their salts, osylates and other sulphonate esters, sulphonamides, sulphonyl halides and miscellaneous derivatives such as disulphones, thermochemical data for this class of compounds are disappointingly sparse and often suspect. Thus the data will not be presented in the form of tables, but rather will be discussed one primary reference at a time per subsection. Because the required gas phase data are almost totally absent, we will also not attempt to generate Benson increments1 for groups of interest such as S02(C)(0), as would be part of a thermochemical study of sulphonic acids and their esters but not the isomeric sulphites that contain the SO(0)2 group. As such, this chapter is unlike so many of the other thermochemical chapters in the other volumes of The Chemistry of the Functional Groups series. 

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