Nitrosylsulfuric acid is the chemical compound with the formula HSO4NO. It is a colourless solid that is used industrially in the production of caprolactam,[3] 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.
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IUPAC name
Nitrosylsulfuric acid
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Other names
nitrosonium bisulfate, chamber crystals
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Identifiers | |
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3D model (JSmol)
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ECHA InfoCard | 100.029.058 |
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CompTox Dashboard (EPA)
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Properties | |
HSO4NO | |
Molar mass | 127.08 g/mol |
Appearance | Pale yellow crystals[1] |
Density | 1.865 g/mL in 40% sulfuric acid soln [2] |
Melting point | 70 °C (158 °F; 343 K)[1] |
Boiling point | Decomposes |
Decomposes | |
Solubility | Soluble in H2SO4[1] |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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Oxidizer |
Related compounds | |
Other anions
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NOCl |
Other cations
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NaHSO4 |
Related compounds
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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
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In organic chemistry, it is used as a reagent for nitrosating, as a diazotizing agent, and as an oxidizing agent.[1]
A typical procedure entails dissolving sodium nitrite in cold sulfuric acid:[4][5]
It can also be prepared by the reaction of nitric acid and sulfur dioxide.[6]
HSO4NO is used in organic chemistry to prepare diazonium salts from amines, for example in the Sandmeyer reaction. Related NO-delivery reagents include nitrosonium tetrafluoroborate [NO]+[BF4]− and nitrosyl chloride.
In industry, the nitrosodecarboxylation reaction between nitrosylsulfuric acid and cyclohexanecarboxylic acid is used to generate caprolactam:[3]
Nitrosylsulfuric acid is a hazardous material and precautions are indicated.[1]
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