Exchange of Halide for Hydroxide

Triorgano telluronium halides are converted to triorgano telluronium hydroxides upon shaking with an aqueous suspension of silver oxide . In most instances, the triorgano telluronium hydroxide is not isolated but reacted with an acid such as hydrofluoric acid or picric acid to produce telluronium salts with an acid-derived anion. 

Carboxymethyl Diphenyl Telluronium Hydroxide 5.0 g (12 mmol) of carboxymethyl diphenyl telluronium bromide and 2.0 g (8.6 mmol) of silver oxide in 45 ml of water are shaken for 4 days. The mixture is filtered, the filtrate is concentrated under vacuum at 20°, and the crystals are collected m.p. 118°. 

Examples of similarly prepared triorgano telluronium hydroxides are  

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