Equilibrium acidities for contact ion pair caesium salts of delocalized carbanions are reported for tetrahydrofuran and are similar to values in other solvents.Quantitative and semi-quantitative equilibrium acidity scales have been established for weak carbon acids in several solvents, including cyclohexylamine (CHA),l dimethoxyethane (DME),2 and dimethyl sulphoxide (DMSO).3 In contrast, relatively few data are available concerning equilibrium acidities in tetrahydrofuran (THF) solution, despite the common use of this solvent for carbanion reaction^.^ We report a scale of hydrocarbon acidities in THF spanning a
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