211176

Selenous acid

98%

• Synonym(s): Selenious acid
• Linear Formula: H₂SeO₃
• CAS Number: 7783-00-8
• Molecular Weight: 128.97
• EC Number: 231-974-7
• MDL number: MFCD00011331
• UNSPSC Code: 12352301
• PubChem Substance ID: 24852658
• NACRES: NA.22

Properties

• Quality Level: 200
• Assay: 98%
• form: solid
• mp: 70 °C ((lit.)); 70 °C (dec.) (lit.)
• solubility: water: 50 mg/mL
• density: 3.004 g/mL at 25 °C ((lit.)); 3.004 g/mL at 25 °C (lit.)
• SMILES string: O[Se](O)=O; O[Se](O)=O
• InChI: 1S/H2O3Se/c1-4(2)3/h(H2,1,2,3); 1S/H2O3Se/c1-4(2)3/h(H2,1,2,3)
• InChI key: MCAHWIHFGHIESP-UHFFFAOYSA-N; MCAHWIHFGHIESP-UHFFFAOYSA-N

Description

Application

Selenous acid can be used as a reagent to synthesize:

• α-Ketoacectals by reacting with acetophenones and triethylorthoformate in the presence of boron trifluoride etherate as a catalyst.
• 4-Formyl-7-methylcoumarin using 4,7-dimethylcoumarin in the presence of xylene as a solvent.
• Selenium substituted quinoxaline derivatives from 2,3-dichloro quionoxaline.

Safety Information

• Pictograms: GHS06,GHS08,GHS09
• Signal Word: Danger
• Hazard Statements: H301 + H331,H373,H410
• Precautionary Statements: 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
• Storage Class Code: 6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves