内吸磷-S-甲基

Description

demeton-S-methyl · CAS 919-86-8 · C6H15O3PS2. UNII HU8BO5S9WK. Boiling Point: 192 °F at 0.15 mmHg (EPA, 1998); Boiling Point: at 0.13kPa: 118 °C; Density: 1.21 at 20 °C.

Identification

CAS Registry Number	919-86-8
PubChem CID	13526
Molecular formula	C6H15O3PS2
IUPAC name	1-dimethoxyphosphorylsulfanyl-2-ethylsulfanylethane
UNII (FDA)	HU8BO5S9WK

Computed Descriptors

Molecular Weight	230.3
XLogP3	1
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	5
Rotatable Bond Count	7
Exact Mass	230.02002368
Monoisotopic Mass	230.02002368
Topological Polar Surface Area	86.1
Heavy Atom Count	12
Formal Charge	0

Physical & Chemical Properties

Boiling Point	192 °F at 0.15 mmHg (EPA, 1998)
Boiling Point	at 0.13kPa: 118 °C
Density	1.21 at 20 °C
Density	1.21 @ 20°C
Vapor Pressure	0.00036 mmHg at 68 °F (EPA, 1998)
Vapor Pressure	3X10-4 mm Hg at 20 °C
Vapor Pressure	0.0003 [mm Hg] @20 °C
LogP	log Kow = 1.02
LogP	1.32
Collision Cross Section	150.48 Ų [M+Na]+

Physical description & handling notes

• Demeton-s-methyl is a pale yellow oil. Used as an insecticide. Not registered as a pesticide in the U.S. (EPA, 1998)
• Oily, colorless to pale yellow liquid with an unpleasant odor; [ACGIH]
• COLOURLESS-TO-PALE YELLOW OILY LIQUID WITH CHARACTERISTIC ODOUR.
• Oily colorless to pale yellow liquid
• Colorless oil
• Unpleasant odor

GHS Hazard Classification

Reported hazard statements	H301, H311, H411

Documented Uses

• Used as an insecticide and acaricide to control aphids, red spider mites, whiteflies, leaf hoppers, and sawflies on vegetables, fruits, and hops; [ACGIH]
• No longer registered for use in the USA; [ACGIH]
• Controls aphid vectors of virus diseases, white-flies, leafhoppers, and sawflies.
• Systemic and contact insecticide and acaracide used to control aphids, red spider mites, whiteflies, leafhoppers, and sawflies on garden crops, fruits, and hops.
• Demeton-S-methyl is made by the reaction of beta-hydroxyethyl sulfide (made in turn from ethyl mercaptan and ethylene oxide). It is reacted with O,O-dimethyl hydrogen phosphorothioate to give demeton-S-methyl.
• Alkylation of O,O-dimethyl-thiophosphoric acid with 2-(ethylmercapto)-ethyl chloride.

Synonyms

DEMETON-S-METHYL; 919-86-8; Metaisoseptox; Metaisosystox; Metasystox 55; Mifatox; Metasystox J; Methyl isosystox; Duratox; Thiometon oxon; Methyl demeton thioester; Demetox; Demeton-S-metile; Bayer 25/154; O,O-Dimethyl S-ethylmercaptoethyl thiophosphate; BAY 18436

Frequently Asked Questions

What are the CAS number and molecular formula of demeton-S-methyl?

CAS 919-86-8; molecular formula C6H15O3PS2; molecular weight — g/mol.

What other names is demeton-S-methyl known by?

DEMETON-S-METHYL, 919-86-8, Metaisoseptox, Metaisosystox, Metasystox 55, Mifatox.

Is demeton-S-methyl classified as hazardous?

Hazard statements reported: H301, H311, H411.

What are the key physical properties of demeton-S-methyl?

Boiling Point: 192 °F at 0.15 mmHg (EPA, 1998); Boiling Point: at 0.13kPa: 118 °C; Density: 1.21 at 20 °C; Density: 1.21 @ 20°C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.