سلنیوم دی‌اکسید Selenium dioxide 8006530250 مرک

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Selenium dioxide

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(sublimed) for synthesis

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5 G

$34.60

50 G

$49.10

250 G

$187.00

1 KG

$591.00

Synonym(s):

Selenium dioxide, Selenious anhydride, Selenium(IV) oxide

Empirical Formula (Hill Notation):

O2Se

CAS Number:

7446-08-4

Molecular Weight:

110.96

EC Index Number:

231-194-7

8006530250

$187.00

Availability

Estimated to ship onAugust 09, 2024

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Properties

vapor pressure

<1 Pa ( 20 °C)

Quality Level

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

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][2]
It can also be used as an oxidizing reagent to synthesize:

• Amides by oxidative amidation of aldehydes with amines.[1]

• Tropone from cycloheptatriene in the presence of potassium dihydrogen phosphate.[1]

• Acetyltetrahydrobenzofurans by oxidation of conjugated dienones.[1]

• 9-hydroxy-undec-10-ynoate from methyl undec-10-ynoate.[3]

Analysis Note

Assay (iodometric): ≥ 98.0 %