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325473

Sigma-Aldrich

Selenium dioxide

reagent grade, powder, 98%

Synonym(s):
NSC 56753, Selenium oxide
Linear Formula:
SeO2
CAS Number:
Molecular Weight:
110.96
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.22

grade

reagent grade

Quality Level

vapor pressure

1 mmHg ( 157 °C)

assay

98%

form

powder

reaction suitability

reagent type: oxidant

color

off-white to pink

mp

315 °C (subl.) (lit.)

SMILES string

O=[Se]=O

InChI

1S/O2Se/c1-3-2

InChI key

JPJALAQPGMAKDF-UHFFFAOYSA-N

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Application

Selenium dioxide (SeO2) is mainly used to oxidize the α-methylene carbon atoms adjacent to a double bond to form allylic hydroxy derivatives.[82]
Other applications:
  • SeO2 reacts with olefins in the presence of tert-butyl hydrogen peroxide to form allylic alcohols without the formation of rearrangement or dehydration by-products.
[83] This reagent system is also useful for the oxidation reactions of acetylenic fatty esters.[82]
  • SeO2 can be used for the oxidation of 1,3,5-cycloheptatriene to form tropone.
  • [84]
  • Piperidoindole systems on oxidation with SeO2 forms either 2-acyl- or 3-acyl-indoles or fully aromatic β-carbolines, depending on the starting material.
  • [85]
  • SeO2 reacts with chlorotrimethylsilane to form selenium oxychloride in situ, which is an effective chlorinating reagent for alcohols. This reagent is a better alternative to thionyl chloride and other chlorinating agents.
  • [86]

    Packaging

    5, 100, 500 g in glass bottle

    Signal Word

    Danger

    Hazard Statements

    Hazard Classifications

    Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - STOT RE 2

    Storage Class Code

    6.1D - Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects

    WGK

    WGK 2

    Flash Point(F)

    Not applicable

    Flash Point(C)

    Not applicable

    Personal Protective Equipment

    dust mask type N95 (US), Eyeshields, Gloves

    Certificate of Analysis

    Enter Lot Number to search for Certificate of Analysis (COA).

    Certificate of Origin

    Enter Lot Number to search for Certificate of Origin (COO).

    More Documents

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