From Tellurinic Acid Chlorides or Nitrates

Arenetellurinic acid chlorides and nitrates were converted to arenetellurinic acids by treatment with aqueous sodium hydroxide. 

Benzenetellurinic Acid Benzenetellurinyl nitrate is dissolved in 1 molar aqueous sodium hydroxide solution, the resultant solution is neutralized with 1 molar aqueous hydrochloric acid, and filtered. The solid is washed with water and dried m.p. 211°. 

Similarly prepared were 4-methoxy- and 4-ethoxybenzenetellurinic acids.  

4-Hydroxy-3,5-dinitrobenzenetellurinic acid nitrate was saponified to the tellurinic acid in refluxing 20% aqueous sulfuric acid.  

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