3, 5-Dimethylpyrazole promoted sulfonation of acetic anhydride by H 2 SO 4 to sulfoacetic acid and methanedisulfonic acid, and crystal structures of the complexes …

S Jianrattanasawat, G Mezei

Index: Jianrattanasawat, Sarut; Mezei, Gellert Inorganica Chimica Acta, 2012 , vol. 384, p. 318 - 323

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Citation Number: 2

Abstract

Sulfuric acid can sulfonate acetic anhydride (but not acetic acid) to sulfoacetic acid, and also to methanedisulfonic acid in the presence of 3, 5-dimethylpyrazole. Under the experimental conditions employed, sulfonation of 3, 5-dimethylpyrazole with concentrated sulfuric acid in acetic anhydride/acetic acid as solvent leads to a mixture of approximately 47mol% 3, 5- dimethylpyrazole-4-sulfonic acid, 34mol% sulfoacetic acid and 19mol% ...