Molecular Structure of Methomyl (CAS NO.16752-77-5):

IUPAC Name: Methyl (1E)-N-(methylcarbamoyloxy)ethanimidothioate 
Molecular Weight: 162.2101 g/mol
Molecular Formula: C₅H₁₀N₂O₂S 
Density: 1.17 g/cm³ 
Melting Point: 78°C
Boiling Point: 144°C
Index of Refraction: 1.508
Molar Refractivity: 41.18 cm³
Molar Volume: 137.9 cm³
Surface Tension: 36.3 dyne/cm
XLogP3: 0.6
H-Bond Donor: 1
H-Bond Acceptor: 3
Rotatable Bond Count: 3
Tautomer Count: 2
Exact Mass: 162.046298
MonoIsotopic Mass: 162.046298
Topological Polar Surface Area: 50.7
Heavy Atom Count: 10 
Storage Temp.: 0-6 °C
Water Solubility: 5.8 g/100 mL
Canonical SMILES: CC(=NOC(=O)NC)SC
Isomeric SMILES: C/C(=N\OC(=O)NC)/SC
InChI: InChI=1S/C5H10N2O2S/c1-4(10-3)7-9-5(8)6-2/h1-3H3,(H,6,8)/b7-4+
InChIKey: UHXUZOCRWCRNSJ-QPJJXVBHSA-N
EINECS: 240-815-0
Product Categories: INSECTICIDE; Alpha sort; CarbamatesMethod Specific; Endocrine Disruptors (Draft)Pesticides&Metabolites; EPA; H-MAlphabetic; Insecticides; M; META - METH; Pesticides; Endocrine Disruptors (Draft)Alphabetic 

 Methomyl (CAS NO.16752-77-5) is a carbamate insecticide. It was introduced in 1966, but its use is restricted because of its high toxicity to humans. Its current primary use is on alfalfa for forage.

Hazard Codes: T+, N, Xn, F, Xi
Risk Statements: 28-50/53-36-20/21/22-11-36/37/38 
R28:Very toxic if swallowed. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
R36:Irritating to eyes. 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
R11:Highly flammable. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 1/2-22-36/37-60-61-45-16-36-26 
S1/2:Keep locked up and out of the reach of children. 
S22:Do not breathe dust. 
S36/37:Wear suitable protective clothing and gloves. 
S60:This material and its container must be disposed of as hazardous waste. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S16:Keep away from sources of ignition. 
S36:Wear suitable protective clothing. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
RIDADR: UN 2757
RTECS: AK2975000
HazardClass: 6.1(a)
PackingGroup: II 

 Methomyl (CAS NO.16752-77-5) is also named as 1-(Methylthio)acetaldehyde O-methylcarbamoyloxime ; 1-(Methylthio)ethylideneamino methylcarbamate ; 2-Methylthio-acetaldehyd-O-(methylcarbamoyl)-oxim ; 2-Methylthio-acetaldehyd-O-(methylcarbamoyl)-oxim [German] ; 2-Methylthio-propionaldehyd-O-(methylcarbamoyl)-oxim ; 2-Methylthio-propionaldehyd-O-(methylcarbamoyl)-oxim [German] ; 3-Thiabutan-2-one, O-(methylcarbamoyl)oxime ; AI3-27341 ; Acetimidothioic acid, methyl-, N-(methylcarbamoyl) ester ; BRN 2042050 ; Caswell No. 549C ; Du Pont insecticide 1179 ; Dupont 1179 ; ENT 27,341 ; EPA Pesticide Chemical Code 090301 ; Ethanimidothioic acid, N-(((methylamino)carbonyl)oxy)-, methyl ester (9CI) ; HSDB 1736 ; IN 1179 ; Insecticide 1,179 ; Lannate ; Lannate L ; Lannate LV ; Methyl O-(methylcarbamyl)thiolacetohydroxamate ; Metomil ; Metomil [Italian] ; N-(((Methylamino)carbonyl)oxy)ethanimidothioic acid methyl ester ; N-((Methylcarbamoyl)oxy)thioacetimidic acid methyl ester ; NU-Bait II ; Nudrin ; RCRA waste number P066 ; S-Methyl N-(methylcarbamoyloxy)thioacetimidate ; SD 14999 ; WL 18236 .  Methomyl (CAS NO.16752-77-5) is white crystalline solid with slight sulfurous smell. It is water soluble. Methomyl is a carbamate ester. Carbamates are chemically similar to, but more reactive than amides. Like amides they form polymers such as polyurethane resins. Carbamates are incompatible with strong acids and bases, and especially incompatible with strong reducing agents such as hydrides. Flammable gaseous hydrogen is produced by the combination of active metals or nitrides with carbamates. Strongly oxidizing acids, peroxides, and hydroperoxides are incompatible with carbamates. Methomyl has high oral toxicity, moderate inhalation toxicity and low skin toxicity. When heated to decomposition, Methomyl emits very toxic fumes of nitrogen oxides and sulfur oxides.