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Selenium dioxide

Name: Selenium dioxide
Brand: MM
Price: 28.95 USD
Availability: InStock

(sublimed) for synthesis

Synonym(s):

Selenium dioxide, Selenious anhydride, Selenium(IV) oxide

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5 g	Check Cart for Availability	$38.60 $28.95
50 g	Check Cart for Availability	$54.80
250 g	Check Cart for Availability	$205.00
1 kg	Check Cart for Availability	$646.00 $484.50

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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Developments in Synthetic Application of Selenium(IV) Oxide and Organoselenium Compounds as Oxygen Donors and Oxygen-Transfer Agents.

Jacek Młochowski et al.

Molecules (Basel, Switzerland), 20(6), 10205-10243 (2015-06-06)

A variety of selenium compounds were proven to be useful reagents and catalysts for organic synthesis over the past several decades. The most interesting aspect, which emerged in recent years, concerns application of hydroperoxide/selenium(IV) oxide and hydroperoxide/organoselenium catalyst systems, as

Selenium (IV) Oxide

Hoekstra WJ, et al.

eEROS (Encyclopedia of Reagents for Organic Synthesis) (2017)

Oxidation reactions of acetylenic fatty esters with selenium dioxide/tert-butyl hydroperoxide.

M S Jie et al.

Lipids, 32(10), 1119-1123 (1997-11-14)

Reaction of methyl undec-10-ynoate (1) with selenium dioxide/tert-butyl hydroperoxide (TBHP) in aqueous dioxane gave methyl 9-oxo-undec-10-ynoate (2, 9%) and 9-hydroxy-undec-10-ynoate (3, 60%), while methyl octadec-9-ynoate (4) yielded mixtures of positional isomers of mono-keto (viz. methyl 8-oxo- and 11-oxo-octadec-9-ynoate, 5, 5%)

Global Trade Item Number

SKU	GTIN
8006530050	04022536361413
8006539999	04022536361444
8006531000	04022536361437
8006530005	04027269276256
8006530250	04022536361420

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