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Abstract
A number of linear (C5-C14) and branched (C5-C8) 1-alkenes were sulfonated by SO3 free or as its dioxane adduct in liquid phase. The composition of the mixtures just after SO3-consumption and several days later was investigated. In addition a thermochemical approach, by means of contributed bond energies, and a kinetic study of the evolution of the sulfonation mixtures show, at least with linear substrates, that a β-sultone is the product under kinetic control and slowly isomerizes into more stable alkenesulfonic acids, then γ- and δ-sultones. However alkenesulfonic acids, originating from the same zwitterionic intermediate as β-sultone, are already present in small amount at the very beginning of the sulfonation.