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Rongalite, also called Rongalit (registered trademark of BASF) is sodium hydroxymethylsulfinate, or Na+HOCH2SO2-. The salt has many names, including also sodium formaldehyde sulfoxylate. It is water-soluble and generally sold as the dihydrate.
Additional recommended knowledge
This salt is prepared from sodium dithionite:
This reaction proceeds quantitatively, such that dithionite can be determined by its conversion to rongalite, which is far less O2-sensitive and thus easier to handle.
NaHOCH2SO2 can essentially be considered to be a source of SO22-. As such it is used both as a reducing agent and as a reagent to introduce SO2 groups into organic molecules. Treatment of elemental Se and Te with NaHOCH2SO2 gives solutions containing the corresponding Na2Sex and Na2Tex, where x is approximately 2. As a nucleophile, NaHOCH2SO2 reacts with alkylating agents to give sulfones.
Occasionally, alkylation will occur also at oxygen, thus α,α' dibromoxylene gives both the sulfone and the isomeric sulfinate ester.
The compound is used primarily as an industrial bleaching agent.
Zinc formaldehyde sulfoxylate
The zinc complex Zn(HOCH2SO2]2 is marketed under the trademarks Decroline, Decolin, and Safolin. This compound is an additive in polymers and textiles.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rongalite". A list of authors is available in Wikipedia.|