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Pentanenitrile, valeronitrile or butyl cyanide is a nitrile with the formula C4H9CN. This can be written BuCN, with Bu representing an n-butyl (linear butyl group).
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| Names | |
|---|---|
| Preferred IUPAC name
Pentanenitrile | |
Other names
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| Identifiers | |
3D model (JSmol) |
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| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.003.439 |
| EC Number |
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PubChem CID |
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| UNII | |
| UN number | 3273 |
CompTox Dashboard (EPA) |
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| Properties | |
| C5H9N | |
| Molar mass | 83.134 g·mol−1 |
| Appearance | Colorless liquid |
| Density | 0.8008 |
| Melting point | −96.2 °C (−141.2 °F; 177.0 K) |
| Boiling point | 141 °C; 286 °F; 414 K |
| Critical point (T, P) | 610.3 K at 35.80 bar |
| insoluble | |
| Solubility | soluble in benzene, acetone, ether |
| Vapor pressure | 5 mmHg |
Refractive index (nD) |
1.3949 |
| Hazards | |
| GHS labelling: | |
   | |
| Danger | |
| H226, H301, H302 | |
| P210, P233, P240, P241, P242, P243, P264, P270, P280, P301+P310, P301+P312, P303+P361+P353, P321, P330, P370+P378, P403+P235, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | 40 °C (104 °F; 313 K) |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
191 mg/kg fat[1] |
| Related compounds | |
Related alkanenitriles |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Pentanenitrile can be produced by heating 1-chlorobutane with sodium cyanide in dimethyl sulfoxide. This reaction takes about 20 minutes, keeping the temperature below 160 °C. The yield is about 93%.[2]
Another way to get the substance is by heating valeraldehyde with hydroxylamine.[3]
The pentanenitrile molecule is flexible and can adopt a number of different conformers, so that it will naturally be a mixture. These conformers are called anti-anti (30%), anti-gauche (46%), gauche-anti, gauche-gauche-cis, and gauche-gauche-trans.[5]
Pentanenitrile is toxic to animals, and produces its action by the liberation of cyanide by cytochrome P450. The cyanide is detoxified and excreted in urine as thiocyanate.[1]
Pentanenitrile is found in Brassica species and varieties such as broccoli.
Pentanenitrile is hydrolyzed to valeric acid by the fungi Gibberella intermedia,[6] Fusarium oxysporum, and Aspergillus niger in which it induces production of the nitrilase enzyme.[7]
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