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Parathion-methyl

Parathion-methyl structure

CAS No:
298-00-0
Formula:
C8H10NO5PS
Chemical Name:
Parathion-methyl
Synonyms:
Phosphorothioic acid,O,O-dimethyl O-(4-nitrophenyl) ester;Phosphorothioic acid,O,O-dimethyl O-(p-nitrophenyl) ester;8056HC;Dalf;O,O-Dimethyl O-(p-nitrophenyl) phosphorothioate;O,O-Dimethyl O-(4-nitrophenyl) phosphorothioate;Dimethyl 4-nitrophenyl phosphorothioate;O,O-Dimethyl O-(p-nitrophenyl) thiophosphate;Dimethyl p-nitrophenyl thiophosphate;O,O-Dimethyl O-(4-nitrophenyl) thiophosphate;Metacide;Metaphos;Methyl E 605;Methyl parathion;Nitrox 80;Nitrox;M-Parathion;Wofatox;Azofos;BAY 11405;Parathion-methyl;Thiophenit;Vofatox;Azophos;Dimethyl parathion;Methylthiophos;Metron;Metron (pesticide);Dimethyl p-nitrophenyl phosphorothionate;Folidol M;Folidol M 40;Parathion methyl homolog;Sinafid M 48;Meptox;Penncap M;Demethylfenitrothion;Metafos;Metafos (pesticide);Penncap MLS;Oleovofotox;Quinophos;Metacide (insecticide);Paratuf;Parataf;Yphos;ME 605;Probel MP 2;ME 1605;Me 605SP;Folidol 600;Methyl 1605;Folidol M 50;Metacid 50;Metacid;Morphos;Methyl Bladan;Bravik;Bravik 600CE;Mentox 600CE;Methyl 4E;Parathion M;Folisuper 600BR;Methion 48EC;Azophos (pesticide);37359-35-6;63653-66-7
Categories:
Agrochemicals > Insecticides

Description

Methyl parathion is a white to yellow-brown, crystalline solid with a garlic odor.It is slightly soluble in water and has a low vapor pressure (U.S. EPA, 2006b).

Parathion-methyl Basic Attributes

Molecular Weight：

263.21

Exact Mass：

263.21

EC Number：

206-050-1

HScode：

29201100

Characteristics

PSA：

106

XLogP3：

2-3

Appearance：

Methyl parathion is a white crystalline solid which is often dissolved in a liquid solvent carrier. The commercial product is a tan liquid (xylene solution) with a pungent odor. It is slightly soluble to insoluble in water. Usually with the liquid solvent it is a combustible liquid. It is toxic by inhalation, ingestion and skin absorption. It is used as an insecticide.

Density：

1.358 g/cm³ @ Temp: 20 °C

Melting Point：

35-36 °C

Boiling Point：

154 °C @ Press: 1.02 Torr

Flash Point：

46.1°C

Refractive Index：

1.576

Water Solubility：

H2O: 0.005 g/100 mL

Storage Conditions：

APPROX 4°C

Vapor Pressure：

Vapour pressure, Pa at 20°C: 0.001

Vapor Density：

9.1

Toxicity：

Oral-rat LD50: 13 mg/kg; skin-rat LD50: 662 mg/kg

Flammability characteristics：

Combustible in case of open flames and high heat; generates toxic nitrogen oxide, phosphorus oxide and sulfur oxide fumes when heated

Odor：

Pungent, garlic-like odor

Safety Information

Packing level：

Hazard category：

6.1(a)

Transport codes：

UN 2052/2783/2811

wgk germany：

hazard class code：

5-24-26/28-48/22-50/53-10-67-66-51/53-36-20/22-11-65-38

safety instructions：

28-36/37-45-60-61-26-62-16

RTECS Number：

TG0175000

Marks：

T+;N,N,T+,Xn,F

Storage features：

The warehouse is ventilated at low temperature and dry; stored separately from oxidants, acids and food additives

Stability/Shelf Life：

Stable. Flammable.

Precautionary statement(s)：

P210-P273-P280-P304 + P340 + P312-P337 + P313-P391

Hazard Statements：

H225-H319-H336-H411

Toxicity

Toxicity class：

most toxic

Parathion-methyl Use and Manufacturing

Methods of Manufacturing

By O, O- dimethyl sulfide phosphorus oxychloride in the solvent and condensation of p-nitrophenol derived. Azeotropically dehydrate xylene and sodium p-nitrophenol at 96°C (73.3-76.0kPa) for 2-3 hours, add sodium carbonate and copper powder, heat up to about 90°C, and drop O, O-dimethylthio Phosphorus oxychloride. After adding, stir and keep warm for 2-3h. Cool to 50 ℃, filter, rinse the filter residue with a small amount of xylene, the filtrate is washed with 5% sodium carbonate solution until colorless, and then washed with saturated saline to neutrality, separate the oil layer, and distill off xylene under reduced pressure to obtain methyl Parathion crude oil. The original drug is light yellow to light brown liquid or solid. Raw material consumption quota: 210kg/t yellow phosphorus, 690kg/t chlorine gas, 200kg/t sulfur, 600kg/t methanol, 730kg/t sodium p-nitrophenolate.

Uses

Insecticide.

Computed Properties

Molecular Weight:263.21
XLogP3:2.9
Hydrogen Bond Acceptor Count:6
Rotatable Bond Count:4
Exact Mass:263.00173059
Monoisotopic Mass:263.00173059
Topological Polar Surface Area:106
Heavy Atom Count:16
Complexity:279
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes

Material

Phosphorus oxychloride

Toluene

Triethylamine

Tetraphosphorus

Sodium methoxide

Sodium carbonate

Sodium chloride