Demeton-O
Structural formula | ||||||||||||||||
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General | ||||||||||||||||
Surname | Demeton-O | |||||||||||||||
other names |
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Molecular formula | C 8 H 19 O 3 PS 2 | |||||||||||||||
Brief description |
colorless liquid |
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properties | ||||||||||||||||
Molar mass | 258.34 g mol −1 | |||||||||||||||
Physical state |
liquid |
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density |
1.1193 g cm −3 |
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boiling point |
106 ° C (0.53 mbar) |
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Vapor pressure |
negligible |
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solubility |
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Refractive index |
1.4900 (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-O is a chemical compound from the group of thiophosphoric acid esters .
Extraction and presentation
Demeton-O can be obtained by reacting 2-hydroxyethylethyl sulfide with diethyl phosphorochloride thioate in toluene in the presence of anhydrous sodium carbonate and metallic copper . Isomerization produces about a 65:35 mixture of Demeton-S and Demeton-O, the mixture of the two compounds being referred to as Demeton.
properties
Demeton-O is a colorless to yellowish liquid that is sparingly soluble in water. The technical product has an unpleasant odor of mercaptan .
use
Demeton-O is used as a mixture with Demeton-S as an insecticide and acaricide against mites, aphids and insects such as the whitefly , cicadas , thrips and leaf miners .
In Germany, Austria and Switzerland, no pesticides with this active ingredient are permitted.
Individual evidence
- ↑ a b c d e f g h Entry on Demeton-O in the GESTIS substance database of the IFA , accessed on January 10, 2017(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-O 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 298-03-3 or Demeton-O ), accessed on November 2, 2015.
- ↑ a b Entry on Demeton-O in the Hazardous Substances Data Bank , accessed on March 11, 2013.
- ↑ Demeton-O
- ↑ Gyorgy Matolcsy Miklós Nádasy, Viktor Andriska: Pesticide Chemistry (= Studies in Environmental Science . Band 32 ). Elsevier Science Ltd, Amsterdam et al. 1989, ISBN 0-444-98903-X ( page 133 in the Google book search).
- ^ Datasheet Demeton-O, PESTANAL at Sigma-Aldrich , accessed on March 11, 2013 ( PDF ).
- ^ Directorate-General for Health and Food Safety of the European Commission: EU pesticide database ; Entry in the national registers of plant protection products in Switzerland , Austria and Germany ; accessed on March 12, 2016.