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Selenium dioxide

Name: Selenium dioxide
Brand: MM
Price: 536.25 CZK

(sublimed) for synthesis

Synonym(s):

Selenium dioxide, Selenious anhydride, Selenium(IV) oxide

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Size/SKU	Availability	Price
5 g	Please contact Customer Service for Availability	CZK 715.00 CZK 536.25
50 g	Please contact Customer Service for Availability	CZK 1,010.00
250 g	Please contact Customer Service for Availability	CZK 3,840.00
1 kg	Please contact Customer Service for Availability	CZK 13,800.00 CZK 10,350.00

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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Properties

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

Description

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.[1]
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.[2]

Analysis Note

Assay (iodometric): ≥ 98.0 %

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Show Differences

1 of 1

This Item	257710	8.43845	204315
Sigma-Aldrich 8.00653 Selenium dioxide	Sigma-Aldrich 257710 Selenium sulfide	Sigma-Aldrich 8.43845 Selenium disulfide	Sigma-Aldrich 204315 Selenium dioxide
Quality Level 200	Quality Level 100	Quality Level 200	Quality Level 200
solubility 1353 g/L	solubility -	solubility -	solubility -
reaction suitability reagent type: oxidant	reaction suitability -	reaction suitability -	reaction suitability -
density 3.95 g/cm³ at 20 °C	density -	density -	density -
form crystals	form powder	form solid	form solid
storage temp. 2-30°C	storage temp. -	storage temp. 2-30°C	storage temp. -

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pictograms

GHS06,GHS08,GHS09

signalword

Danger

hcodes

H301 + H331,H373,H410

pcodes

P260 - P264 - P273 - P301 + P310 - P304 + P340 + P311 - P314

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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