Terbufos

• S- (tert- butylthiomethyl )-O, O- diethyl dithiophosphate
• S-( (1,1- dimethylethyl ) thiomethyl )-O, O- diethyl dithiophosphate
• Counter

Colorless to yellowish liquid

Liquid

1.105 g ​​· cm -3

-29.2 ° C

69 ° C at 0.01 hPa

0.0346 Pa ( 25 ° C)

• Practically insoluble in water ( 4.5 mg · l-1 at 20 ° C)
• Soluble in most organic solvents

1.52 at 23 ° C.

Risk

Template: Infobox chemical / molecular formula search available

Terbufos is a chemical compound selected from the group of the thiophosphoric acid ester.

Production and representation

Terbufos can be obtained by reaction of O, O- Diethyldithiophosphorsäure with formaldehyde and tert- butanethiol.

Properties

Terbufos is a yellowish liquid, which is practically insoluble in water. Prolonged heating it decomposes above 120 ° C. Reacts with strong bases (pH> 9) and acids (pH <2) hydrolysis ensues. Two major metabolites of terbufos ( terbufos sulfoxide and terbufos sulfone) are poorly soluble in water.

Use

Terbufos is used as a pesticide. It is used in the cultivation of sugar beet and fodder beet to the furrow with soil cover for the control of wireworms and moss button beetles and beet fly and the Black bean aphid. The effect is based on the inhibition of acetylcholinesterase.

In the U.S., it was first approved in 1974 as an insecticide and nematicide to control a variety of insects in corn, sugar beet and sorghum. Between 1987-1996 there an average of about 7.5 million pounds ( 3,400 tons ) of active ingredient per year were used. In November 2006, BASF sold its global business with the insecticide terbufos to the American AMVAC (American Vanguard Corporation).

Terbufos is not included on the approved list in the European Union pesticide active ingredients. In Switzerland, a ( Counter 2G ) plant protection products containing this active substance is approved in Germany and Austria there are no approved drugs.