325473

Selenium dioxide

reagent grade, powder, 98%

• Synonyme(s) : NSC 56753, Selenium oxide
• Formule linéaire : SeO₂
• Numéro CAS: 7446-08-4
• Poids moléculaire : 110.96
• Numéro CE : 231-194-7
• Numéro MDL: MFCD00003562
• Code UNSPSC : 12352303
• ID de substance PubChem : 24859512
• Nomenclature NACRES : NA.22

Propriétés

• Qualité: reagent grade
• Niveau de qualité: 200
• Pression de vapeur: 1 mmHg ( 157 °C)
• Pureté: 98%
• Forme: powder
• Pertinence de la réaction: reagent type: oxidant
• Couleur: off-white to pink
• Pf: 315 °C (subl.) (lit.)
• Chaîne SMILES: O=[Se]=O
• InChI: 1S/O2Se/c1-3-2
• Clé InChI: JPJALAQPGMAKDF-UHFFFAOYSA-N

Description

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.

Informations sur la sécurité

• Pictogrammes: GHS06,GHS08,GHS09
• Mention d'avertissement: Danger
• Mentions de danger: H301 + H331,H373,H410
• Conseils de prudence: P260 - P264 - P273 - P301 + P310 - P304 + P340 + P311 - P314
• Classification des risques: Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - STOT RE 2
• Code de la classe de stockage: 6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
• Classe de danger pour l'eau (WGK): WGK 2
• Point d'éclair (°F): Not applicable
• Point d'éclair (°C): Not applicable
• Équipement de protection individuelle: Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges