Demeton-S

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Structural formula
Structural formula of Demeton-S
General
Surname Demeton-S
other names

O , O- diethyl- S - (2-ethylthioethyl) thiophosphate

Molecular formula C 8 H 19 O 3 PS 2
Brief description

colorless liquid

External identifiers / databases
CAS number 126-75-0
EC number 204-801-8
ECHA InfoCard 100.004.366
PubChem 24723
Wikidata Q2788153
properties
Molar mass 258.34 g mol −1
Physical state

liquid

density

1.132 g cm −3 (21 ° C)

boiling point

128 ° C (1.33 mbar)

Vapor pressure

negligible

solubility
  • slightly soluble in water (2 g l −1 at 20 ° C)
  • soluble in most organic solvents
Refractive index

1,500 (18 ° C)

safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary
06 - Toxic or very toxic

danger

H and P phrases H: 300 + 310
P: 264-280-301 + 310-302 + 350-310
MAK

Switzerland (mixture of Demeton-O and Demeton-S): 0.01 ml · m −3 or 0.1 mg · m −3

Toxicological data
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Demeton-S is a chemical compound from the group of thiophosphoric acid esters .

Extraction and presentation

Demeton-S can be obtained by reacting 2-hydroxyethylethyl sulfide with diethyl chlorothiophosphate in toluene in the presence of anhydrous sodium carbonate and metallic copper . Isomerization produces about a 65:35 mixture of Demeton-O and Demeton-S, the mixture of the two compounds being called Demeton (CAS number: 8065-48-3).

properties

Demeton-S is a colorless liquid that is sparingly soluble in water. The technical product has an unpleasant odor of mercaptan .

use

Demeton-S (like Demeton-S-methyl and Demeton-S-methylsulfoxide ) is used as an acaricide and insecticide against mites, aphids and insects such as whitefly , cicadas, thrips and leaf miners .

Admission

In Germany, Austria and Switzerland, no pesticides with this active ingredient are permitted.

Individual evidence

  1. ↑ a b c d e f g h i Entry on Demeton-S in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .
  2. ↑ a b c d e WHO / FAO Data Sheet on Pesticides (PDS) for Demeton ( Memento from July 2, 2014 in the Internet Archive )
  3. ↑ Entry on Demeton-S in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on August 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
  4. ↑ Swiss Accident Insurance Fund (Suva): Limit values ​​- current MAK and BAT values (search for 126-75-0 or Demeton-S ), accessed on November 2, 2015.
  5. ↑ a b Datasheet Demeton S, analytical standard at Sigma-Aldrich , accessed on March 11, 2013 ( PDF ).
  6. ↑ a b Entry on Demeton-S in the Hazardous Substances Data Bank , accessed on March 11, 2013.
  7. ↑ Demeton-O
  8. ↑ General Directorate Health and Food Safety of the European Commission: Entry on Demeton-S-methyl in the EU pesticide database; Entry in the national registers of plant protection products in Switzerland , Austria and Germany ; accessed on February 24, 2016.