Hydroxylamine-O-sulfonic acid

Hydroxylamine-O-sulfonic acid
	Oxygen, O Nitrogen, N Sulfur, S Hydrogen, H
Names
	Other names Aminosulfuric acid
Identifiers
CAS Number	2950-43-8;
3D model (JSmol)	Interactive image;
ChemSpider	68763;
ECHA InfoCard	100.019.065
EC Number	220-971-6;
PubChem CID	76284;
CompTox Dashboard (EPA)	DTXSID50883542 ;
	InChI InChI=1S/H3NO4S/c1-5-6(2,3)4/h1H2,(H,2,3,4) Key: DQPBABKTKYNPMH-UHFFFAOYSA-N;
	SMILES NOS(=O)(=O)O;
Properties
Chemical formula	H3NO4S
Molar mass	113.09
Appearance	white solid
Melting point	210 °C
Solubility in water	cold water
Acidity (pKa)	1.48
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Hydroxylamine-O-sulfonic acid (HOSA) or aminosulfuric acid is the inorganic compound with molecular formula H₃NO₄S that is formed by the sulfonation of hydroxylamine with oleum. It is a white, water-soluble and hygroscopic, solid, commonly represented by the condensed structural formula H₂NOSO₃H, though it actually exists as a zwitterion and thus is more accurately represented as ⁺H₃NOSO₃⁻. It is used as a reagent for the introduction of amine groups (–NH₂), for the conversion of aldehydes into nitriles and alicyclic ketones into lactams (cyclic amides), and for the synthesis of variety of nitrogen-containing heterocycles.

Names

Oxygen, O Nitrogen, N Sulfur, S Hydrogen, H
Other names Aminosulfuric acid
Identifiers
CAS Number	2950-43-8
3D model (JSmol)	Interactive image
ChemSpider	68763
ECHA InfoCard	100.019.065
EC Number	220-971-6
PubChem CID	76284
CompTox Dashboard (EPA)	DTXSID50883542
InChI InChI=1S/H3NO4S/c1-5-6(2,3)4/h1H2,(H,2,3,4) Key: DQPBABKTKYNPMH-UHFFFAOYSA-N
SMILES NOS(=O)(=O)O
Properties
Chemical formula	H₃NO₄S
Molar mass	113.09
Appearance	white solid
Melting point	210 °C
Solubility in water	cold water
Acidity (pK_a)	1.48
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references