Pirimiphos-methyl

• O-(2 -diethylamino -6- methylpyrimidine -4 -yl) O, O- dimethyl- thiophosphate
• Fernex

Liquid

Liquid

1.17 g · cm -3

15-18 ° C

Decomposition prior to reaching the boiling point ( approximately 100 ° C)

Negligible ( 2.0 x 10-6 kPa at 20 ° C)

• Practically insoluble in water ( 8.6 mg · l-1 at 20 ° C)
• Soluble in most organic solvents

Attention

1250 mg · kg -1 ( LD50, rat, oral)

Template: Infobox chemical / molecular formula search available

Pirimiphos -methyl is a chemical compound from the group of Thiophosphoric.

Production and representation

Pirimiphos -methyl can be obtained by reaction of N, N- Diethylguanidin with acetoacetic ester and reaction of the resulting intermediate with O, O- Dimethylphosphorchlorthioat.

Properties

Pirimiphos -methyl is a liquid which is practically insoluble in water. Pirimiphos-methyl is broken down very quickly in the environment, measured with a half-life in days. The mechanisms are volatilization and photodegradation.

Use

Pirimiphos -methyl is used as an active ingredient in pesticides. Pirimiphos -methyl is a by post-harvest insecticide that is used in the U.S. in embedded maize, millet and seeds. It is used for the control of various insects such as mealybugs and mites, flies ( in cattle ) and cigarette beetles, flour beetles, Flat Grain beetles, moths ( corn and wheat ) and others. The chemically related ethyl derivative ( pirimiphos -ethyl, CAS: 23505-41-1 ) is also used as an insecticide. Pirimiphos - methyl has been approved in the U.S. in 1978 as an insecticide and in 2006 were about 12,000 pounds ( 5.4 t). It acts by inhibiting acetylcholinesterase.

Pirimiphos -methyl was approved in 2007 in the European Union as an insecticide for use on embedded crop. In Germany and Switzerland pesticides are approved with this drug, in Austria not.