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8.00653

Selenium dioxide

(sublimed) for synthesis

Synonym(s):

Selenium dioxide, Selenious anhydride, Selenium(IV) oxide

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About This Item

Empirical Formula (Hill Notation):
O2Se
CAS Number:
7446-08-4
Molecular Weight:
110.96
MDL number:
MFCD00003562
UNSPSC Code:
12352303
EC Index Number:
231-194-7
NACRES:
NA.22
Form:
crystals
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vapor pressure

<1 Pa ( 20 °C)

Quality Segment

200

form

crystals

potency

68.1 mg/kg LD50, oral (Rat)

reaction suitability

reagent type: oxidant

pH

2 (20 °C, 10 g/L in H2O)

mp

340 °C

solubility

1353 g/L

density

3.95 g/cm3 at 20 °C

storage temp.

2-30°C

SMILES string

[Se](=O)=O

InChI

1S/O2Se/c1-3-2

InChI key

JPJALAQPGMAKDF-UHFFFAOYSA-N

Application

Selenium dioxide (SeO2) is mainly used to oxidize the activated carbon-bearing positions (α-methylene carbon atoms), particularly at allylic or propargylic sites. The more substituted end of the double bond undergoes oxidation.
It can also be used as an oxidizing reagent to synthesize:
  • Amides by oxidative amidation of aldehydes with amines.
  • Tropone from cycloheptatriene in the presence of potassium dihydrogen phosphate.
  • Acetyltetrahydrobenzofurans by oxidation of conjugated dienones.
  • 9-hydroxy-undec-10-ynoate from methyl undec-10-ynoate.

Analysis Note

Assay (iodometric): ≥ 98.0 %

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Danger

Hazard Classifications

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

wgk

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

Storage Class

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

Certificates of Analysis (COA)

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