Nitrosylsulfuric acid

Top

Home > Library > Miscellaneous > Wikipedia

Nitrosylsulfuric acid


IUPAC name Nitrosylsulfuric acid
Other names nitrosonium bisulfate, chamber crystals
Identifiers
CAS number	7782-78-7^Y
PubChem	82157
ChemSpider	74147^Y
Jmol-3D images	Image 1
SMILES O=NOS(=O)(=O)O
InChI InChI=1S/HNO5S/c2-1-6-7(3,4)5/h(H,3,4,5)^Y Key: VQTGUFBGYOIUFS-UHFFFAOYSA-N^Y InChI=1/HNO5S/c2-1-6-7(3,4)5/h(H,3,4,5) Key: VQTGUFBGYOIUFS-UHFFFAOYAM
Properties
Molecular formula	HNO₅S
Molar mass	127.08 g/mol
Appearance	pale yellow crystals
Density	1.612 g/mL in 40% sulfuric acid soln
Melting point	73.5 °C
Boiling point	decomposes
Solubility in water	decomposes
Solubility	soluble in H₂SO₄
Hazards
Main hazards	oxidizer
Related compounds
Other anions	NOCl
Other cations	NaHSO₄
Related compounds	NOBF₄
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Nitrosylsulfuric acid is the chemical compound with the formula NOHSO₄. It is a colourless solid that is used industrially in the production of caprolactam.^[1]

Synthesis and reactions

A typical procedure entails dissolving sodium nitrite in concentrated sulfuric acid in an ice bath:^[2]^[3]

HNO₂ + H₂SO₄ → NOHSO₄ +H₂O

The molecule can also be viewed as the mixed acid anhydride of sulfuric acid and nitrous acid. Alternatively, it can be prepared by the reaction of nitric acid and sulfur dioxide.^[4]

NOHSO₄ is useful in organic chemistry to prepare diazonium salts from amines. Related NO-delivery reagents include nitrosonium tetrafluoroborate ([NO]BF₄) and nitrosyl chloride.

References

^ Ritz, J.; Fuchs, H.; Kieczka, H.; Moran, W. C. (2002). "Caprolactam". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a05_031.
^ Hodgson, H. H.; Mahadevan, A. P.; Ward, E. R. (1955), "1,4-Dinitronaphthalene", Org. Synth., http://www.orgsyn.org/orgsyn/orgsyn/prepContent.asp?prep=cv3p0341 ; Coll. Vol. 3: 341 (diazodization followed by treatment with nitrite)
^ Sandin, R. B.; Cairns, T. L. (1943), "1,2,3-Triiodo-5-nitrobenzene", Org. Synth., http://www.orgsyn.org/orgsyn/orgsyn/prepContent.asp?prep=cv2p0604 ; Coll. Vol. 2: 604 (diazodization followed by treatment with iodide)
^ Coleman, G. H.; Lillis, G. A.; Goheen, G. E. (1939). "Nitrosyl Chloride". Inorganic Syntheses 1: 55–59. doi:10.1002/9780470132326.ch20. This procedure generates the nitrosylsulfuric acid as an intermediate en route to NOCl.

Hydrogen compounds

This inorganic compound-related article is a stub. You can help Wikipedia by expanding it.

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

Donate to Wikimedia