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3344-12-5

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Basic Information
CAS No.: 3344-12-5
Name: ISO-MALATHION
Article Data: 4
Molecular Structure:
Molecular Structure of 3344-12-5 (ISO-MALATHION)
Formula: C10H19 O6 P S2
Molecular Weight: 330.363
Synonyms: Butanedioicacid, [[methoxy(methylthio)phosphinyl]thio]-, diethyl ester (9CI); Succinicacid, mercapto-, diethyl ester, S-ester with O,S-dimethyl phosphorodithioate(6CI,7CI,8CI); 8063HC; Isomalathion; O,S-Dimethyl-S-(1,2-dicarboethoxy)ethylphosphorodithioate; Phosphorodithioic acid, O,S-dimethyl ester, S-ester withdiethyl mercaptosuccinate; S-Methyl malathion
Density: 1.273g/cm3
Boiling Point: 413.6°Cat760mmHg
Flash Point: 203.9°C
Hazard Symbols:
Risk Codes: 22-50/53
Safety: A poison by ingestion. When heated to decomposition it emits toxic vapors of POx and SOx.
PSA: 139.31000
LogP: 2.72200
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Chemistry

IUPAC Name: Diethyl 2-[methoxy(methylsulfanyl)phosphoryl]sulfanylbutanedioate
Synonyms of Isomalathion (CAS NO.3344-12-5) : ((Methoxy(methylthio)phosphinyl)thio)butanedioic acid diethyl ester ; Butanedioic acid, ((methoxy(methylthio)phosphinothioyl)thio)diethyl ester ; Isomalathion ; Mercaptosuccinic acid diethyl ester, S-ester with O,S-dimethylphosphorodithioate ; S-Methylmalathion
Product Categories: IEnvironmental Standards;Alphabetic;Analytical Standards;Metabolites;Pesticides&Metabolites
CAS NO:3344-12-5
Molecular Formula:C10H19O6PS2
Molecular Weight :330.358
Molecular Structure :
Index of Refraction:1.501
Surface Tension: 44.4 dyne/cm
Density: 1.273 g/cm3
Flash Point: 203.9 °C
Enthalpy of Vaporization: 66.64 kJ/mol
Boiling Point: 413.6 °C at 760 mmHg
Vapour Pressure: 4.74E-07 mmHg at 25°C

Production

Preparation Products: guanethidine

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
rat LD50 oral 113mg/kg (113mg/kg)   Archives of Toxicology. Vol. 42, Pg. 95, 1979.

Safety Profile

A poison by ingestion. When heated to decomposition it emits toxic vapors of POx and SOx.

Hazard Codes HarmfulXn,DangerousN
Risk Statements 22-50/53
R22: Isomalathion (CAS NO.3344-12-5) is harmful if swallowed. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements 24-60-61
S24:Avoid contact with skin. 
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.
RIDADR UN 1208 3/PG 2
RTECS WM8425000

Specification

Isomalathion (CAS NO.3344-12-5) is an impurity found in some batches of malathion, depending on its method of preparation. It is significantly more toxic to humans than malathion.