Methanethiol
-
Methanethiol
structure -
-
CAS No:
74-93-1
-
Formula:
CH4S
-
Chemical Name:
Methanethiol
-
Synonyms:
Methanethiol;Mercaptomethane;Methyl mercaptan;63933-47-1;505027-72-5;1417534-47-4
- Categories:
-
CAS No:
Description
colourless gas with a garlic-like or rotten cabbage-like smell Methyl mercaptan is a colorless gas or white liquid with a disagreeable odor like garlic or rotten cabbage. Shipped as a liquefied compressed gas. The odor threshold is 0.002 ppm. Methyl mercaptan has an objectionable odor of decomposing cabbage. May be prepared by heating an aqueous solution of potassium methyl sulfate and KHS; from sodium methyl sulfate and potassium sulfhydrate; also from methanol and hydrogen sulfide in the pr
Methanethiol (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 and brain of humans and other animals as well as plant tissues. It is disposed of through animal feces. It occurs naturally in certain foods, such as some nuts and cheese. It is also one of the main compounds responsible for bad breath and the smell of flatus. Methanethiol is classified as a thiol and is sometimes abbreviated as MeSH. It is very flammable.
Characteristics
1
0.78 (est)
Methyl mercaptan appears as a colorless low-boiling liquid that is denser than water. Very toxic by inhalation. Can be absorbed through the skin. Has a sharp odor, but the sense of smell cannot be relied upon to warn of the presence of vapors at low concentrations. Rate of onset: Immediate Persistence: Minutes to hours Odor threshold: 0.002 ppm Source/use/other hazard: From decayed organic matter - pulp mills, oil refineries; highly flammable; liquid burns/frostbite.
0.9600 g/cm3 @ Temp: 25 °C
-123 °C
5.95 °C @ Press: 760 Torr
<71℃
23.30 g/L at 20 °C (quoted, Windholz et al., 1983) 0.330 mol/L at 25 °C (Hine and Weimar, 1965)
Store in a cool place.
1536 mm Hg ( 20 °C)
1.66 (vs air)
Inhalation-Rat LC50: 675 PPM; Inhalation-Mouse 6.53 mg/m3/ 2 hours
It is flammable in case of open flame, high temperature and oxidant; it produces toxic sulfur oxide fumes in combustion; it produces toxic and flammable hydrogen sulfide gas in contact with water and acid
21.8%
Odor of rotten cabbage
Unpleasant cabbage taste
Safety Information
2.3
UN 2037 2.3
3
12-23-50/53
16-25-60-61
PB4375000
F+,T,N
The warehouse is ventilated, low temperature and dry; stored separately from oxidants and acids
Explosive when mixed with air
Stable. Highly flammable - note low flash point. Reacts vigorously or explosively with a wide variety of materials - consult a full MSDS data sheet before using. Incompatible with strong oxidizing agents, alkali and alkaline earth metals, epoxides, hydrazines, ketones, lead, mercury (II) oxide, azo- and diazo- compounds, copp
P210, P261, P271, P273, P304+P340, P311, P321, P377, P381, P391, P403, P403+P233, P405, P501
H220
UN 2037 2.3
P210; P261; P273; P311; P410 + P403; P501
Methanethiol Use and Manufacturing
e preparation method is to put water and thiourea into the reaction kettle, add dimethyl sulfate dropwise, when the temperature naturally rises to 80～90℃, start to heat to 116～120℃, react for 30～40min, discharge, cool and centrifuge , The filter cake is methyl isothiourea sulfate, and then lye is added dropwise to methyl isothiourea sulfate at 80° C., and methyl mercaptan is continuously produced. Methyl mercaptan can also be obtained by reacting methyl chloride and sodium hydrosulfide. Add 36% sodium hydrosulfide into the autoclave, press nitrogen into the methyl chloride, start stirring, control the temperature not to exceed 100°C and the pressure not to exceed 1.7 MPa, and react For 30 minutes, when the temperature and pressure drop to a moderate level, open the pressure valve, control the pressure and flow, and obtain sodium methyl mercaptan after washing and absorption. CH3Cl+NaHS[Pressure]→CH3SH+NaClCH3SH+NaOH→CH3SNa+H2O
Used as an intermediate in organic synthesis, mainly used in synthetic materials, pesticides and medicine
Computed Properties
Molecular Weight:48.11
XLogP3:0.5
Hydrogen Bond Donor Count:1
Hydrogen Bond Acceptor Count:1
Exact Mass:48.00337130
Monoisotopic Mass:48.00337130
Topological Polar Surface Area:1
Heavy Atom Count:2
Complexity:2
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes
Recommended Suppliers of Methanethiol
-
![China]()
CN
5 YRS
Business licensed Certified factoryManufactory Supplier of Dichloromethane,Linocaine hydrochloride -
![China]()
CN
5 YRS
Business licensed Certified factoryManufactory Supplier of Chemical Pesticides,Food Additives,Agrochemicals,Active Pharm Ingredients,Flavors and Fragrances,Chemical Catalyst,Chemical Materials,Chem&Pharm Intermediates,Organic Intermediates,Feed AdditiveInquiryCAS No.: 74-93-1Grade: Industrial GradeContent: 99% -
![China]()
CN
3 YRS
Business licensedTrader Supplier of CHEMICALS,REAGENTSInquiryCAS No.: 74-93-1Grade: Pharmaceutical GradeContent: 99%
Learn More Other Chemicals
-
B-(4-Fluoro-1-naphthalenyl)boronic acid
182344-25-8
-
Methyldopamine hydrochloride
62-32-8
-
Borago officinalis, ext.
84012-16-8
-
terphenyl Formula
26140-60-3
-
6-CHLORO-7-BENZYLPURINE Formula
1928-77-4
-
4-Methoxy-α-phenylbenzenepropanoic acid Formula
4314-68-5
-
5-Bromo-1(2H)-isoquinolinone Structure
190777-77-6
-
4-Benzylpiperidine Structure
31252-42-3
-
What is Lopinavir Intermediate 2
192726-06-0
-
What is 2,2-Dimethyl-3-phenylpropanol
13351-61-6