S0505

Sodium sulfite

≥98%

• Linear Formula: Na₂SO₃
• CAS Number: 7757-83-7
• Molecular Weight: 126.04
• EC Number: 231-821-4
• MDL number: MFCD00003503
• UNSPSC Code: 12352302
• PubChem Substance ID: 329824427
• NACRES: NA.55

Properties

• Agency: suitable for SM 5210
• Assay: ≥98%
• form: powder or crystals
• pH: 9.0-10.5 (25 °C, 126 g/L)
• SMILES string: [Na+].[Na+].[O-]S([O-])=O
• InChI: 1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
• InChI key: GEHJYWRUCIMESM-UHFFFAOYSA-L

Description

General description

Sodium sulfite is a water-soluble inorganic salt that is commonly used as a reagent for sulfonation and sulfomethylation reactions. Additionally, it is also used as a bleaching, de-sulfurizing, and dechlorinating agent.

Application

Sodium sulfite can be used as:      

• A source of sulfur dioxide (SO₂) in the synthesis of 1,4 diazabicyclo[2.2.2]octane bis(sulfur dioxide) (DABSO).      
• A reducing agent in the photocatalytic cyclization of 2-isocyanoaryl thioethers to synthesize 2-CF₂/CF₃-containing benzothiazoles in the presence of Ir-based catalyst.     
• A reagent in the selective synthesis of 2-amino-1-iodonaphthalene from 2-naphthylamine in the presence of NaIO₃/HCl.

In combination with carboxylic acids, it forms an effective system for the reductive acylation of aromatic nitro compounds.

Safety Information

• Supplementary Hazards: EUH031
• Storage Class Code: 13 - Non Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable