SELENIUM DIOXIDE [SeO2]

·         CAS Number 7446-08-4

·         Linear Formula SeO₂

·         Molecular Weight 110.96

·          EC Number 231-194-7

·          MDL number MFCD00003562

·          PubChem Substance ID 24851959

Selenium dioxide is the chemical compound with the formula SeO₂. This colorless solid is one of the most frequently encountered compounds of selenium.

Detailed description

Occurrence

The natural form of selenium dioxide, downeyite, is a very rare mineral. It is found in only a very few burning coal dumps.^[6]

Uses

Organic synthesis

SeO₂ is an important reagent in organic synthesis. Oxidation of paraldehyde (acetaldehyde trimer) with SeO₂ gives glyoxal^[7] and the oxidation of cyclohexanone gives cyclohexane-1,2-dione.^[8] The selenium starting material is reduced to selenium, and precipitates as a red amorphous solid which can easily be filtered off.^[8] This type of reaction is called a Riley oxidation. It is also renowned as a reagent for "allylic" oxidation,^[9] a reaction that entails the following conversion

This can be described more generally as;

R₂C=CR'-CHR"₂ + [O] → R₂C=CR'-C(OH)R"₂

where R, R', R" may be alkyl or aryl substituents.

As a colorant

Selenium dioxide imparts a red colour to glass. It is used in small quantities to counteract the colour due to iron impurities and so to create (apparently) colourless glass. In larger quantities, it gives a deep ruby red colour.

Selenium dioxide is the active ingredient in some cold-blueing solutions.

It was also used as a toner in photographic developing.

Safety

Selenium is an essential element, but ingestion of more than 5 mg/day leads to nonspecific symptoms.

PRICE

$7693/KG OR $3496/IB

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