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The basicity constants of eleven methyl 1,2‐benzanthracenes and the absorption spectra of their conjugate acids were measured in anhydrous hydrofluoric acid. It could be shown that in every case two isomeric ions, in which the proton has reacted with either of the two meso carbon atoms, were present. The basicity constants of the conjugate acids could be determined. The relative increase of this constant on methyl substitution is compared with theory.
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Mackor et al. (1956) studied this question.
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