Butane-1-thiol
Butane-1-thiol, also known as butyl mercaptan, is a volatile, clear to yellowish liquid with a fetid (extremely foul-smelling) odor, commonly described as "skunk" odor. In fact, 1-butanethiol is structurally similar to several major constituents of a skunk's defensive spray but is not actually present in the spray. The scent of 1-butanethiol is so strong that the human nose can easily detect it in the air at concentrations as low as 10 parts per billion. The threshold level for 1-butanethiol is reported as 1.4 ppb
| Names | |
|---|---|
| Preferred IUPAC name
Butane-1-thiol | |
| Other names
Butyl mercaptan n-Butyl mercaptan Thiobutyl alcohol Mercaptobutane n-Butanethiol 1-Mercaptobutane | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.003.370 |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C4H10S | |
| Molar mass | 90.18 g·mol−1 |
| Appearance | Clear liquid |
| Odor | cabbage-like, skunk-like, garlic-like |
| Density | 0.83679 g/mL |
| Melting point | −115.8 °C (−176.4 °F; 157.3 K) |
| Boiling point | 98.2 °C (208.8 °F; 371.3 K) |
| Slightly soluble (0.06% at 20°C) | |
| Vapor pressure | 35 mmHg (20°C) |
| Hazards | |
| NFPA 704 (fire diamond) | |
| Flash point | 2 °C; 35 °F; 275 K |
| Lethal dose or concentration (LD, LC): | |
LC50 (median concentration) |
4020 ppm (rat, 4 hr) 2500 ppm (mouse, 4 hr) 770 ppm (dog, 30 min) |
| NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 10 ppm (35 mg/m3) |
REL (Recommended) |
C 0.5 ppm (1.8 mg/m3) [15-minute] |
IDLH (Immediate danger) |
500 ppm |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
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