Methyl thiocyanate

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Methyl thiocyanate
Methyl thiocyanate.svg
Methyl thiocyanate 3D spacefill.png
IUPAC name
methyl thiocyanate
Systematic IUPAC name
methyl thiocyanate
Other names
Thiocyanic acid methyl ester;[1] Methylrhodanid; methylrhodanate; Methylthiokyanat; Thiocyanomethane; Methyl rhodanide; Methyl thiocyanate; thiocyanato-methan; methylsulfocyanate; Methylsalfocyanate[2]
3D model (Jmol)
ECHA InfoCard 100.008.305
EC Number 209-134-6
MeSH C047435
Molar mass 73.117
Appearance Colourless liquid
Density 1.074 g/cm3
Melting point −51 °C (−60 °F; 222 K)
Boiling point 132 °C (270 °F; 405 K) (101.3 kP)
Slightly soluble[3]
Solubility in Diethyl ether Miscible[3]
bent C-S-CN
R-phrases R10, R23/24/25[1]
S-phrases S16, S26, S27, S28[1]
NFPA 704
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g., gasoline) Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 38 °C (100 °F; 311 K)[1]
Related compounds
Related compounds
Methyl isocyanate
Methyl isothiocyanate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Methyl thiocyanate is an organic compound with the formula CH3SCN. It is a colourless liquid with an onion-like odor. It is produced by the methylation of thiocyanate salts. The compound is a precursor to the more useful isomer methyl isothiocyanate (CH3NCS).[4]


The LD50 is 60 mg/kg (rats, oral).

It is listed as an extremely hazardous substance by the United States's Emergency Planning and Community Right-to-Know Act.[5]


  1. ^ "Chemical book page". Retrieved June 29, 2011. 
  2. ^ a b "United States chemical entree". Retrieved June 29, 2011. 
  3. ^ F. Romanowski, H. Klenk "Thiocyanates and Isothiocyanates, Organic" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH: Weinheim. doi:10.1002/14356007.a26 749
  4. ^ 40 C.F.R.: Appendix A to Part 355—The List of Extremely Hazardous Substances and Their Threshold Planning Quantities (PDF) (July 1, 2008 ed.), Government Printing Office, retrieved March 8, 2009