Skip to Content
Merck
All Photos(4)

Documents

325473

Sigma-Aldrich

Selenium dioxide

reagent grade, powder, 98%

Synonym(s):

NSC 56753, Selenium oxide

Sign Into View Organizational & Contract Pricing
All Photos(4)

About This Item

Linear Formula:
SeO2
CAS Number:
7446-08-4
Molecular Weight:
110.96
EC Number:
231-194-7
MDL number:
MFCD00003562
UNSPSC Code:
12352303
PubChem Substance ID:
24859512
NACRES:
NA.22

grade

reagent grade

Quality Level

200

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

Looking for similar products? Visit Product Comparison Guide

Related Categories

Application

Selenium dioxide (SeO2) is mainly used to oxidize the α-methylene carbon atoms adjacent to a double bond to form allylic hydroxy derivatives.
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. This reagent system is also useful for the oxidation reactions of acetylenic fatty esters.
  • SeO2 can be used for the oxidation of 1,3,5-cycloheptatriene to form tropone.
  • Piperidoindole systems on oxidation with SeO2 forms either 2-acyl- or 3-acyl-indoles or fully aromatic β-carbolines, depending on the starting material.
  • 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.

Signal Word

Danger

Hazard Statements

H301 + H331 - H373 - H410

Hazard Classifications

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

Storage Class Code

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which 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

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Customers Also Viewed

Slide 1 of 7

1 of 7

Tellurium dioxide ≥99%

Sigma-Aldrich

243450

Tellurium dioxide

95%

Sigma-Aldrich

796948

Sodium selenide

Selenium powder, max. particle size 250 micron, weight 200 g, purity 99.95%

GF33939849

Selenium

Sodium selenite 99%

Sigma-Aldrich

214485

Sodium selenite

Selenium sulfide

Sigma-Aldrich

257710

Selenium sulfide

Selenium pellets, <5 mm, ≥99.99% trace metals basis

Sigma-Aldrich

209643

Selenium

98%

Sigma-Aldrich

N9608

4′-Nitroacetophenone

Selenium dioxide catalyzed conversion of alcohols to alkyl chlorides by chlorotrimethylsilane.
Lee J G and Kang K K
The Journal of Organic Chemistry, 53(15), 3634-3637 (1988)
Oxidation reactions of acetylenic fatty esters with selenium dioxide/tert-butyl hydroperoxide.
Jie M S L K, et al.
Lipids, 32(10), 1119-1123 (1997)
Tropone. Selenium Dioxide Oxidation of 1, 3, 5-Cycloheptatriene.
Radlick P.
The Journal of Organic Chemistry, 29(4), 960-960 (1964)
Selenium dioxide oxidations in the indole area. Synthesis of β-carboline alkaloids.
Cain M, et al.
Journal of the American Chemical Society, 105(4), 907-913 (1983)
Allylic oxidation of olefins by catalytic and stoichiometric selenium dioxide with tert-butyl hydroperoxide.
Umbreit M A and Sharpless K B
Journal of the American Chemical Society, 99(16), 5526-5528 (1977)
View All Related Papers

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service