Demeton-O-methyl

Uses Demeton-s-methyl is a pale yellow oil that has a sulfur-like odor. It is a systemic and contact insecticide and acaricide. It kills insects that feed on plants by sucking juices. It is used to control aphids, sawflies, and spider mites in fruits, vegetables, potatoes, cereals, ornamentals, and forestry. Demeton-s-methyl replaces methyl demeton, a mixture of demeton-s-methyl and demeton-o-methyl sold as systox meta. Demeton-s-methyl is more toxic to insects than demeton-o-methyl. It is available as an emulsifiable concentrate.28,40... 

Note. The name Demeton-methyl used to be applied to a mixture of demeton-S-methyl and demeton-O-methyl but this mixture has been replaced by demeton-S-methyl. 

DEMETIL-7-CLOROTETRACICIJNA see AOJ500 DEMETON-O-METHYL see DA0800 DEMETON-S-METHYL see DAP400 DEMETON-S-METHYLSULFON (GERMAN) see DAP600... 

The 0,0-dimethyl homologues of the derivatives discussed above, such as demeton-O-methyl (59) and demeton-S-methyl (60), attained importance because of their lower toxicity (Schrader, 1950d Lorenz et al., 1955 Miihlmann et al., 1954 Lorenz et al., 1955). Demeton-methyl, like its diethyl homologue discussed above, contains 70% of the thiono isomer (59) and 30% of the thiol isomer (60). 

Synonyms Bay 21097 Bayer 21097 Demeton-methyl sulfoxide Demeton-O-methyl sulfoxide Demeton-5 -methyl sulfoxide 0,0-Dimethyl 5 -(2-eththionylethyl) phospho-rothioate Dimethyl 5 -(2-eththionylethyl) thiophosphate 0,0-Dimethyl 5 -2-(ethylsulfi-nyl)ethyl phosphorothioate 0,0-Dimethyl S -2-(ethylsulfinyl)ethyl thiophosphate 0,0-Dimethyl iS-ethylsulphinylethyl phosphorothioate ENT 24964 dimethyl phosphorothioate Isomethylsystox sulfoxide Metaisosystox sulfoxide Metasystemox Metasystox-R Methyl demeton-O-sulfoxide Metilmercaptofosoksid Oxydemetonmethyl Phosphothioic acid 0,0-dimethyl S -2-(ethylsulfinyl)ethyl ester R 2170. 

Demeton—methyl is a mixture of 0,0-dimethyl 0- (2-ethyltliio)ethyl phosphorothioate (demeton—methyl O [8022-00-2] (46)) (bp 74°C at 20 Pa), soluble in water to 330 mg/L, and 0,0-dimethyl S-(2-ethylthio)ethyl phosphorothioate (demeton—methyl S) (bp 89°C at 20 Pa), soluble in water to 3.3 g/L. The rat oral LD5Qs are demeton O 180 and demeton S 40, 60 mg/kg. Demeton—methyl is a less persistent and safer systemic insecticide. 

Gas chromatography has been used [183] to determine the following at organophosphorus insecticides at the microgram per litre level in water and waste water samples Azinphos-methyl, Demeton-O, Demeton-S, Diazinon, Disulfoton, Malathion, Parathion-methyl and Parathion-ethyl. This method is claimed to offer several analytical alternatives, dependent on the analyst s assessment of the nature and extent of interferences and the complexity of the pesticide mixtures found. Specifically, the procedure uses a mixture of 15% v/v methylene chloride in hexane to extract... 

Demeton (including Demeton-o, Demeton-s, Demet methyl and Dmeton-s-methyl-sulphone)... 

Cyanophos, Demeton-S-methyl, Diazinon, Dichlorvos/DDVP, Dicrotophos, Dimethoate, Dimethylvinphos, Disulfoton, EPN, Ethion, Ethoprophos, Famphur, Fenamiphos, Fenitrothion, Fenthion, Fosthiazate, FFeptenophos, Isofenphos, Isopropyl O-metho aminothio-phosphoryl) salicylate, Isoxathion, Malathion, Mecarbam, Methamidophos, Methidathion, Mevinphos, Monocrotophos, Naled, Omethoate, Oxydemeton-methyl, Parathion, Parathion-methyl, Phenthoate, Phorate, Phosalone, Phosmet, Phosphamidon, Phoxim, Piriiniphos-, ethyl, Profenofos,... 

Methyl-4-chlorophenoxyacetic acid, see MCPA Methyl chlorophos, see Trichlorfon l-(2-Methylcychohexyl)-3-phenylurea, see Siduron A -(2-Methylcyclohexyl)-A7-phenylurea, see Siduron Methyl demeton-O-sulfoxide, see Oxydemeton-methyl Methyl 5-(2,4-dichlorophenoxy)-2-nitrobenzoate, see Bifenox... 

Many xenobiotics contain alkyl groups, such as the methyl (-CH3) group, attached to atoms of O, N, and S. An important step in the metabolism of many of these compounds is replacement of alkyl groups by H, as shown in Figure 7.6. These reactions are carried out by mixed-function oxidase enzyme systems. Examples of these kinds of reactions with xenobiotics include O-dealky-lation of methoxychlor insecticides, N-dealkylation of carbary 1 insecticide, and S-dealkylation of dimethyl mercaptan. Organophosphate esters (see Chapter 18) also undergo hydrolysis, as shown in Reaction 7.3.12 for the plant systemic insecticide demeton ... 

Methyl Demeton. Phosphorothioic acid 0-[2-(eth-ylthiolethyl] O.O-dimethyl ester ntixt with S-[2-(ethylthio)-... 

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