Reaktion #70142

Reaktionsgleichung

dimethyl dithiophosphoric acid

diethyl maleate

dimethyl dithiophosphoric acid

diethyl maleate

Hydroquinone

→

malathion

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeseparate solutions
2. 2
   workup.ADDITIONan organic solution of diethyl maleate and an aqueous solution of dimethyl dithiophosphoric acid, was mixed for about 8 hours at 53° C. under a nitrogen atmosphere
3. 3
   workup.ADDITIONAfter mixing
4. 4
   Sonstigethe organic and aqueous solutions were separated
5. 5
   Waschenwas washed two (2) times with water (approximately 1 liter each time)
6. 6
   SonstigeThe organic and aqueous solutions were separated

Vorschrift

The solution of dimethyl dithiophosphoric acid was added to diethyl maleate (the ratio of dimethyl dithiophosphoric acid to diethyl maleate was approximately 1-1.25 kg:1.2 kg). Hydroquinone (approximately 3 grams) was added to the mixture. The reaction mixture which contains two separate solutions, an organic solution of diethyl maleate and an aqueous solution of dimethyl dithiophosphoric acid, was mixed for about 8 hours at 53° C. under a nitrogen atmosphere. After mixing, the reaction was cooled to ambient temperature and the organic and aqueous solutions were separated. The organic or diethyl maleate solutions which contained malathion was washed two (2) times with water (approximately 1 liter each time). The organic and aqueous solutions were separated and the malathion in the solution of diethyl maleate retained. This reaction yielded approximately 1.5-1.9 kg of malathion.

Quelle