Demeton is a light brown liquid with an odor
of sulfur compounds; freezing/melting point ≤‐13
C
Colinesterase inhibitor. Insecticide
ChEBI: Demeton-S is an organothiophosphorus compound.
Demeton-S is produced through a multi-step synthesis that builds its organophosphorothioate insecticidal structure. The process begins with the preparation of 2-ethylthioethanol, which serves as the thiol-containing alcohol precursor. This intermediate is then reacted with diethyl thiophosphoryl chloride (a phosphorus halide reagent) under controlled conditions to form the phosphorothioate ester linkage. The reaction introduces the diethylthiophosphate group onto the sulphur-substituted ethyl chain, yielding O,O-diethyl S-[2-(ethylthio)ethyl] phosphorothioate.
Systemic with contact and stomach action. Acetylcholinesterase (AChE) inhibitor.
Poison by ingestion,
intraperitoneal, and subcutaneous routes.
When heated to decomposition it emits very
toxic fumes of POx and SOx. See also
DEMETON-0 + DEMETON-S and other
demeton entries.
A potential danger to those involved
in the manufacture, formulation, and application of this
systemic insecticide and acaricide.
UN3278 Organophosphorus compound, liquid,
toxic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous
materials, Hazard Technical Name Required, Potential
Inhalation Hazard (Special Provision 5). UN3017
Organophosphorus pesticides, liquid, toxic, flammable,
flash point not , 23
C, Hazard class: 6.1; Labels: 6.1-
Poisonous materials, 3-Flammable liquid. UN2810 Toxic
liquids, organic, n.o.s., Hazard Class: 6.1; Labels: 6.1-
Poisonous materials, Technical Name Required.
May form explosive mixture with air.
Strong oxidizers, strong bases, soluble mercury, other
pesticides, and water.
The thiono-and thiolo-isomers of
this mixture are 50% hydrolyzed in 75 minutes and 0.85 min-
ute, respectively @ 20℃
and pH 13. At pH 9 and 70 ℃
, the
half-life of Demeton is 1.25 hour, but an pH 1-5 it is over
11 hours. Sand and rushed limestone may be added together
with a flammable solvent; the resultant mixture may be burned
in a furnace with afterburner and alkaline scrubber
.In
accordance with 40CFR165, follow recommendations for the
disposal of pesticides and pesticide containers. Must be dis-
posed properly by following package label directions or by
contacting your local or federal environmental control agency,
or by contacting your regional EPA office.
