Selenium dioxide

≥99.9% trace metals basis

NSC 56753, Selenium oxide
Linear Formula:
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:
Pricing and availability is not currently available.

Quality Level

vapor pressure

1 mmHg ( 157 °C)


≥99.9% trace metals basis

reaction suitability

reagent type: oxidant


315 °C (subl.) (lit.)

SMILES string




InChI key


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Selenium dioxide (SeO2) can be used as:
  • An oxidizing agent to introduce carbonyl functional groups at activated carbon.
  • A catalyst in the allylic hydroxylation reactions.
  • An oxidant in the synthesis of amides by oxidative amidation of aldehydes with amines.
  • A catalyst to synthesize di and trioxidized bicyclic cyclopentenones by reacting with Pauson-Khand reaction (PKR) products.
  • A catalyst along with iodine (I2) to prepare mono and bis-sulfenylindoles by treating indoles with diaryl disulfides via C-H sulfenylation.
  • A catalyst to synthesize alkyl and aryl nitriles from the corresponding aldehydes via the formation of aldoxime.
  • A selenium precursor to synthesize FeSe nanostructures via electrochemical deposition method.

It can also be used as a versatile reagent for allylic oxidation and oxidative-elimination reactions.


5, 25 g in glass bottle

Signal Word


Hazard Statements

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


UN 3283 6.1 / PGIII

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
Y. Zhang, et al.,
Heterocycles, 83, 2337-2342 (2011)
Yilin Wang et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 79(5), 1311-1315 (2011-06-15)
A novel method has been developed for the synthesis of thioglycolic acid (TGA)-capped CdSe quantum dots (QDs) in an aqueous medium when selenium dioxide worked as a selenium source and sodium borohydride acted as a reductant. The interaction between CdSe...
Metal-free synthesis of amides by oxidative amidation of aldehydes with amines in PEG/oxidant system
Liang J, et al.
Tetrahedron, 67(44), 8532-8535 (2011)
P. Y. Chen, et al.,
Thin Solid Films, 519, 8397-8400 (2011)
Electrodeposition of nano-dimensioned FeSe
Chen PY, et al.
Thin Solid Films, 519(23), 8397-8400 (2011)

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