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Selenium trioxide
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Selenium trioxide : ウィキペディア英語版
Selenium trioxide

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Selenium trioxide is the inorganic compound with the formula SeO3. It is white, hygroscopic solid. It is also an oxidizing agent and a Lewis acid. It is of academic interest as a precursor to Se(VI) compounds.〔Egon Wiberg, Arnold Frederick Holleman (2001) ''Inorganic Chemistry'', Elsevier ISBN 0123526515〕
==Preparation==
Selenium trioxide is difficult to prepare because it is unstable with respect to the dioxide:
:2 SeO3 → 2 SeO2 + O2
It has been generated in a number of ways despite the fact that the dioxide does not combust under normal conditions.〔One method entails dehydration of anhydrous selenic acid with phosphorus pentoxide at 150-160 °C. The reaction of liquid sulfur trioxide with potassium selenate
:SO3 + K2SeO4 → K2SO4 + SeO3

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