About this bookExcerpt from Meta Toluene Sulphonic Acid and Related Compounds
Barth (ann. Chem. (liebig) working similarly but fusing under different conditions which also caused oxidation of the methyl group to a carboxyl group obtained para hydroxy benzoic acid and salicylic acid (ortho hydroxy benzoic acid.) This also proved.that the sulphonic acid group had entered in the ortho and para positions.
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