Demeton-S
Structural formula | ||||||||||||||||
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General | ||||||||||||||||
Surname | Demeton-S | |||||||||||||||
other names |
O , O- diethyl- S - (2-ethylthioethyl) thiophosphate |
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Molecular formula | C 8 H 19 O 3 PS 2 | |||||||||||||||
Brief description |
colorless liquid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 258.34 g mol −1 | |||||||||||||||
Physical state |
liquid |
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density |
1.132 g cm −3 (21 ° C) |
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boiling point |
128 ° C (1.33 mbar) |
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Vapor pressure |
negligible |
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solubility |
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Refractive index |
1,500 (18 ° C) |
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safety instructions | ||||||||||||||||
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MAK |
Switzerland (mixture of Demeton-O and Demeton-S): 0.01 ml · m −3 or 0.1 mg · m −3 |
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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
- ↑ 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) .
- ↑ a b c d e WHO / FAO Data Sheet on Pesticides (PDS) for Demeton ( Memento from July 2, 2014 in the Internet Archive )
- ↑ 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 .
- ↑ 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.
- ↑ a b Datasheet Demeton S, analytical standard at Sigma-Aldrich , accessed on March 11, 2013 ( PDF ).
- ↑ a b Entry on Demeton-S in the Hazardous Substances Data Bank , accessed on March 11, 2013.
- ↑ Demeton-O
- ↑ 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.