Molecule structure of Methyl thiocyanate (CAS NO.556-64-9) :

IUPAC Name: methyl thiocyanate 
Molecular Weight: 73.11692 g/mol
Molecular Formula: C₂H₃NS
Density: 1.061 g/cm³
Melting Point: -5 °C
Boiling Point: 123.1 °C at 760 mmHg   
Flash Point: 38.3 °C
Index of Refraction: 1.47
Molar Refractivity: 19.22 cm³
Molar Volume: 68.9 cm³
Polarizability: 7.62×10^-24 cm³
Surface Tension: 37.6 dyne/cm 
Enthalpy of Vaporization: 36.1 kJ/mol 
log P (octanol-water): 0.730 
Water Solubility: 4.27E+04 mg/L 
Vapor Pressure: 12.1 mm Hg 
Henry's Law Constant: 4.38E-05 atm-m³/mole 
Atmospheric OH Rate Constant: 1.06E-12 cm³/molecule-sec
XLogP3-AA: 0.9
H-Bond Acceptor: 1
Exact Mass: 72.99862
MonoIsotopic Mass: 72.99862
Topological Polar Surface Area: 23.8
Heavy Atom Count: 4
Complexity: 41.2
Canonical SMILES: CSC#N
InChI: InChI=1S/C2H3NS/c1-4-2-3/h1H3
InChIKey: VYHVQEYOFIYNJP-UHFFFAOYSA-N
Storage Temp.: poison room
Merck: 6127 
EINECS: 209-134-6

 Methyl thiocyanate (CAS NO.556-64-9) is used as an agricultural insecticide, a fumigant and as a research chemical. No evidence of commercial production in the U.S. It is also used for the synthesis of pesticides, medicine and other fine chemicals.

By the reaction of dimethyl sulfate and potassium cyanide sulfur derived. Be KSCN dissolved in water, dropwise dimethyl sulfate to control the temperature below 60 °C, about 3h dropping finish. And then continue stirring 2h. Place overnight. Taken by the water reservoir while the system was finished washing.

Reported in EPA TSCA Inventory. EPA Extremely Hazardous Substances List.

Poison by ingestion, intravenous, and subcutaneous routes. When heated to decomposition it emits very toxic fumes of NO_x and SO_x. See also THIOCYANATES.
Hazard Codes: T
Risk Statements: 23/24/25-10-36/37
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed. 
R10:Flammable. 
R36/37:Irritating to eyes and respiratory system.
Safety Statements: 28A-27-26-16-45-36/37/39 
S28:After contact with skin, wash immediately with plenty of soap-suds. 
S27:Take off immediately all contaminated clothing. 
S16:Keep away from sources of ignition. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
RIDADR: UN1992
RTECS: XL1575000
HazardClass: 3
PackingGroup: III
Hazardous Substances Data: 556-64-9(Hazardous Substances Data)

 Methyl thiocyanate (CAS NO.556-64-9) is also called 4-03-00-00327 (Beilstein Handbook Reference) ; AI3-16178 ; BRN 1098357 ; HSDB 5691 ; Methane, thiocyanato- ; Methyl rhodanate ; Methyl sulfocyanate ; Methylrhodanid
 ; Methylthiokyanat ; NSC 9368 ; Thiocyanic acid, methyl ester . Methyl thiocyanate (CAS NO.556-64-9) is colorless liquid with an odor of onions and is very slightly soluble in water.  Methyl thiocyanate is a moderately toxic liquid, flammable. Violent, possibly explosive oxidation reaction when mixed with chlorates, nitrates, nitric acid, organic or inorganic peroxides, perchlorates. On contact with mineral acids or acid fumes deadly toxic hydrogen cyanide gas is produced. When heated to decomposition or on contact with mineral acids, Methyl thiocyanate emits highly toxic fumes of nitriles, oxides of sulfur and nitrogen. Methyl thiocyanate is highly toxic if ingested. It is a rapidly acting poison. Methyl thiocyanate (CAS NO.556-64-9) is Incompatible with nitric acid. Violent reactions have occurred when mixed with chlorates, nitrates, nitric acid, organic peroxides, peroxides, potassium chlorate, and sodium chlorate. Methyl thiocyanate is volatile. So the storage environment should be ventilate, low-temperature and dry. Keep  Methyl thiocyanate (CAS NO.556-64-9) separate from oxidants, acids, and food additives.