Tetrachlorvinphos

Powder.Partially soluble in chloroform; slightly soluble in water. Technical tetrachlorvinphos is a tan-to-brown crystalline solid. Tetrachlorvinphos is stable at ,100 C and slowly hydrolyzed at 50°C. Aromatic odor.
Soluble in water at 24°C 15 ppm; limited solubility in most aromatic hydrocarbons.

Preparation of pentachloroacetophenone Trichloroethylene and a small amount of azobisisobutyronitrile (catalyst) were fed with dry oxygen at 100°C and reacted at 110°C for 10 h under a pressure of 6.5 × 105 Pa to obtain dichloroacetyl chloride. Then, dichloroacetyl chloride was dropped into 1, 2, 4-trichlorobenzene and anhydrous aluminum trichloride slurry, and the temperature was raised to 90°C for 4 hours to prepare pentachloroacetophenone. The yield can reach 79.87%. n15D1.5854～1.590. Preparation of trimethyl phosphite The effect of phenol and phosphorus trichloride is easy to receive a good yield, first to produce triphenyl phosphite, and then with an excess of anhydrous methanol in the presence of sodium methoxide in an emulsification reaction The transesterification reaction is carried out in the tower at a temperature of 130-150°C. Trimethyl ester is taken out of the top of the tower with excess methanol vapor. After distillation, methanol and trimethyl ester are separated, and the phenol from the bottom of the tower is recycled. The synthetic pentachloroacetophenone of dicamba is put into the reaction pot, and trimethyl phosphite is added dropwise at 30-50°C, then the temperature is raised to 110°C, the reaction is held for 0.5h, and treated with ethanol (or ether and pentane) Insecticide with a yield of 77.13%.

Insecticide.