Nitrosylsulfuric acid

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Nitrosylsulfuric acid
Structural formula of nitrosylsulfuric acid
Ball-and-stick model of the nitrosylsulfuric acid molecule
Names
IUPAC name
Nitrosylsulfuric acid
Other names
nitrosonium bisulfate, chamber crystals
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.058
Properties
HNO5S
Molar mass 127.08 g/mol
Appearance Pale yellow crystals[1]
Density 1.612 g/mL in
40% sulfuric acid soln
Melting point 70 °C (158 °F; 343 K)[1]
Boiling point Decomposes
Decomposes
Solubility Soluble in H2SO4[1]
Hazards
Main hazards Oxidizer
Related compounds
Other anions
NOCl
Other cations
NaHSO4
Related compounds
NOBF4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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,[2] and was formerly part of the lead chamber process for producing sulfuric acid. The compound is the mixed anhydride of sulfuric acid and nitrous acid.

In organic chemistry, it is used as a reagent for nitrosating, as a diazotizing agent, and as an oxidizing agent.[1]

Synthesis and reactions[edit]

A typical procedure entails dissolving sodium nitrite in cold sulfuric acid:[3][4]

HNO2 + H2SO4 → NOHSO4 + H2O

It can also be prepared by the reaction of nitric acid and sulfur dioxide.[5]

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

Safety[edit]

Nitrosylsulfuric acid is a hazardous material and precautions are indicated.[1]

References[edit]

  1. ^ a b c d e George A. Olah, G. K. Surya Prakash, Qi Wang, Xing-Ya Li. "Nitrosylsulfuric Acid". e-EROS Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn060.
  2. ^ Ritz, J.; Fuchs, H.; Kieczka, H.; Moran, W. C. (2002). "Caprolactam". Ullmann's Encyclopedia of Industrial Chemistry. Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a05_031. ISBN 3527306730.
  3. ^ Hodgson, H. H.; Mahadevan, A. P.; Ward, E. R. (1955). "1,4-Dinitronaphthalene". Organic Syntheses.; Collective Volume, 3, p. 341 (diazodization followed by treatment with nitrite)
  4. ^ Sandin, R. B.; Cairns, T. L. (1943). "1,2,3-Triiodo-5-nitrobenzene". Organic Syntheses.; Collective Volume, 2, p. 604 (diazodization followed by treatment with iodide)
  5. ^ Coleman, G. H.; Lillis, G. A.; Goheen, G. E. (1939). "Nitrosyl Chloride". Inorganic Syntheses. Inorganic Syntheses. 1: 55–59. doi:10.1002/9780470132326.ch20. ISBN 9780470132326. This procedure generates the nitrosylsulfuric acid as an intermediate en route to NOCl.