Trisha Shetty (Editor)

Nitrosylsulfuric acid

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Related compounds  NOBF4
Formula  HNO5S
Melting point  73.5 °C
Pubchem  82157
Molar mass  127.08 g/mol
Density  1.61 g/cm³
Appearance  pale yellow crystals
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Attempts to make nitrosylsulfuric acid

Nitrosylsulfuric acid is the chemical compound with the formula NOHSO4. It is a colourless solid that is used industrially in the production of caprolactam, and was formerly part of the lead chamber process for producing sulfuric acid.


Synthesis and reactions

A typical procedure entails dissolving sodium nitrite in concentrated sulfuric acid in an ice bath:

HNO2 + H2SO4 → NOHSO4 +H2O

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

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


Nitrosylsulfuric acid Wikipedia