Methanethiol
Methanethiol /ˌmɛθ.eɪn.ˈθaɪ.ɒl/ (also known as methyl mercaptan) is an organosulfur compound with the chemical formula CH
3SH. It is a colorless gas with a distinctive putrid smell. It is a natural substance found in the blood, brain and feces of animals (including humans), as well as in plant tissues. It also occurs naturally in certain foods, such as some nuts and cheese. It is one of the chemical compounds responsible for bad breath and the smell of flatus. Methanethiol is the simplest thiol and is sometimes abbreviated as MeSH. It is very flammable.
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| Names | |||
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| Preferred IUPAC name
Methanethiol | |||
| Other names
Methyl mercaptan Mercaptomethane Methiol Thiomethyl alcohol/Thiomethanol Methylthiol | |||
| Identifiers | |||
3D model (JSmol) |
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| 3DMet | |||
| ChEBI | |||
| ChemSpider |
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| ECHA InfoCard | 100.000.748 | ||
| EC Number |
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| KEGG | |||
PubChem CID |
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| RTECS number |
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| UNII | |||
| UN number | 1064 | ||
CompTox Dashboard (EPA) |
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| Properties | |||
| CH3SH | |||
| Molar mass | 48.11 g·mol−1 | ||
| Appearance | colorless gas | ||
| Odor | Distinctive, like that of rotten cabbage or eggs | ||
| Density | 0.9 g/mL (liquid at 0°C) | ||
| Melting point | −123 °C (−189 °F; 150 K) | ||
| Boiling point | 5.95 °C (42.71 °F; 279.10 K) | ||
| 2% | |||
| Solubility | alcohol, ether | ||
| Vapor pressure | 1.7 atm (20°C) | ||
| Acidity (pKa) | ~10.4 | ||
| Hazards | |||
| GHS labelling: | |||
| Danger | |||
| H220, H331, H410 | |||
| P210, P261, P271, P273, P304+P340, P311, P321, P377, P381, P391, P403, P403+P233, P405, P501 | |||
| NFPA 704 (fire diamond) | |||
| Flash point | −18 °C; 0 °F; 255 K | ||
| 364 °C; 687 °F; 637 K | |||
| Explosive limits | 3.9%-21.8% | ||
| Lethal dose or concentration (LD, LC): | |||
LD50 (median dose) |
60.67 mg/kg (mammal) | ||
LC50 (median concentration) |
3.3 ppm (mouse, 2 hr) 675 ppm (rat, 4 hr) | ||
| NIOSH (US health exposure limits): | |||
PEL (Permissible) |
C 10 ppm (20 mg/m3) | ||
REL (Recommended) |
C 0.5 ppm (1 mg/m3) [15-minute] | ||
IDLH (Immediate danger) |
150 ppm | ||
| Related compounds | |||
Related compounds |
Ethanethiol | ||
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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