Sodium hydrosulfite, tech.

• Catalog No.: 33381
• CAS Number: 7775-14-6
• M. F.: Na2O4S2
• M. W.: 174.10714
• Purity: 85+%

SYNONYMS

• Title: 连二亚硫酸钠 , tech.
• IUPAC name: disodium sulfinatosulfinate
• IUPAC Traditional name: disodium dithionite
• Synonyms: Sodium dithionite; Sodium hypodisulfite

DATABASE IDS

• MDL Number: MFCD00011640
• EC Number: 231-890-0
• Merck Index: 148626
• CAS Number: 7775-14-6

PROPERTIES

• Purity: 85+%
• Apperance: Powder
• Melting Point: 52°C dec.
• GHS Hazard statements: H251-H302
• European Hazard Symbols: X
• European Hazard Symbols: Oxidising (O)
• GHS Precautionary statements: P280-P235+P410-P301+P312-P420-P407-P501A
• Risk Statements: 7-22-31
• Safety Statements: 7/8-26-28-43
• Storage Warning: Moisture Sensitive
• TSCA Listed: 是
• Hazard Class: 4.2
• UN Number: UN1384
• Packing Group: II

REFERENCES

• Useful reducing agent for a variety of functional groups. Often used in aqueous mixtures in combination with a base such as bicarbonate to prevent decomposition of the reagent by acid.
• Examples of reductions with the reagent:
• Nitroso compounds to amines: Org. Synth. Coll., 2, 33 (1943); 4, 247, (1963). Azo compounds to amines: Org. Synth. Coll., 1, 49 (1941); 2, 35, 39 (1943). Quinones to hydroquinones: Org. Synth. Coll., 4, 16 (1963). Aldehydes and ketones to alcohols: Synthesis, 246 (1977); for a phase-transfer method giving improved yields, see: J. Chem. Soc., Chem. Commun., 1080 (1979). For selective 1,4-reduction of conjugated aldehydes and ketones in the presence of unconjugated, see: Tetrahedron Lett., 36, 1107 (1995). Dehalogenation of ɑ-halo ketones: Synth. Commun., 12, 261 (1982).
• For a review of reductions with dithionite, including nitrogen functions, carbonyl compounds and 1,4-reductions of enones, see: Bull. Soc. Chim. Fr., 565 (1986).
• Also useful in small amounts as a decolorizing agent in the purification of organic compounds; see, e.g.: Org. Synth. Coll., 3, 86, 637 (1955); 4, 45 (1963).