Methanethiol

Methanethiol

Methanethiol
Ball-and-stick model of the methanethiol molecule Space-filling model of the methanethiol molecule
Names
Preferred IUPAC name Methanethiol
Other names Methyl mercaptan Mercaptomethane Methiol Thiomethyl alcohol/Thiomethanol Methylthiol
Identifiers
CAS Number	74-93-1 Y
3D model (JSmol)	Interactive image
Abbreviations	MM MeSH
ChEBI	CHEBI:16007 Y
ChemSpider	855 Y[chemspiders]
ECHA InfoCard	100.000.748
EC Number	200-822-1
KEGG	C00409 Y
PubChem CID	878
RTECS number	PB4375000
UNII	2X8406WW9I Y
UN number	1064
CompTox Dashboard (EPA)	DTXSID5026382
InChI InChI=1S/CH3SH/c1-2/h2H,1H3 N Key: LSDPWZHWYPCBBB-UHFFFAOYSA-N Y InChI=1/CH3SH/c1-2/h2H,1H3 Key: LSDPWZHWYPCBBB-UHFFFAOYAW
SMILES SC
Properties
Chemical formula	CH4S
Molar mass	48.10 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)
Solubility in water	2%
Solubility	alcohol, ether
Vapor pressure	1.7 atm (20°C)
Acidity (pKa)	~10.4
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H220, H331, H410
Precautionary statements	P210, P261, P271, P273, P304+P340, P311, P321, P377, P381, P391, P403, P403+P233, P405, P501
NFPA 704 (fire diamond)	4 4 1
Flash point	−18 °C; 0 °F; 255 K
Autoignition temperature	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 chalcogenols	Methanol Methaneselenol Methanetellurol
Related compounds	Hydrogen sulfide Ethanethiol Methanedithiol Dimethyl sulfide Sodium methanethiolate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Methanethiol (/ˌmɛθeɪnˈθaɪ.ɒl/ METH-ayn-THY-ol), also called methyl mercaptan, is an organosulfur compound with the chemical formula CH₃SH. It is a colorless flammable gas with a distinctive putrid smell. In small amounts, it is pervasive in nature and found in certain foods, such as some nuts and cheese. It contributes to many odors, including the emissions from pulp mills, bad breath, and flatus. Methanethiol is the simplest thiol and is sometimes abbreviated as MeSH.