Dichlorvos

Dichlorvos is available as an oily colourless to amber liquid with an aromatic chemical odour. It is slightly soluble in water but soluble in kerosene, ethanol, chloroform, and acetone and miscible with alcohol, aromatic and chlorinated hydrocarbon solvents, aerosol propellants, and other non-polar solvents. Dichlorvos in contact with strong acids or alkalis undergoes decomposition and releases hazardous products toxic gases and vapours such as phosphorus, chlorinated oxides, and carbon monoxid

Dehydrochlorination method Trichlorfon dehydrochlorination under alkaline conditions generates dichlorvos. During operation, control the content of trichlorfon water suspension to 25% (you can also use refined trichlorfon mother liquor, plus timely trichlorfon solids), the ratio of trichlorfon to alkali is 1: (1.35 ~ 1.4), use water With toluene (xylene, benzene) two solvents, the reaction temperature is 50 ~ 60 ℃, the reaction time is 20 ~ 25min, the end point pH value is 7 ~ 8. This reaction rearranges the α-hydroxyphosphonate into phosphate. At the end of the reaction, the solution was allowed to stand for separation. The oil layer was evaporated through a thin film to recover the solvent, and dichlorvos crude oil was obtained. For the direct synthesis method for the preparation of trimethyl phosphite, see the preparation method of dicamba. Preparation of dichlorvos This method utilizes the reaction of trimethyl phosphite and trichloroacetaldehyde to remove one molecule of methyl chloride and synthesize it, which is called perkow reaction. During operation, trimethyl phosphite (or trichloroacetaldehyde) is added dropwise to trichloroacetaldehyde (or trimethyl phosphite) at room temperature. The heat released needs to be cooled, and the drop temperature is controlled to 60 ℃. At 90℃ for 70 minutes, the ratio of trimethyl phosphite and trichloroacetaldehyde is 1:1, and the yield is 94.53%.

Insecticide.It can be used as a fumigant in households and public places. It is also suitable for the prevention and control of various pests on cotton, fruit trees, vegetables, tobacco, tea, mulberry and other crops; it has fumigation, stomach poisoning and contact killing effects, and it is harmful to chewing insects and thorns. Mouthpart pests have good control effects; dichlorvos has the effects of fumigation, stomach poisoning and contact killing, and has good control effects on chewing mouthparts pests and piercing and sucking mouthparts pests. Dichlorvos has a high vapor pressure and has a strong knockdown power against pests. It is easy to decompose after application and has a short residual effect period. There are many ways to use it, which is simple and easy to use. It is suitable for controlling various pests on cotton, fruit trees, vegetables, sugarcane, tobacco, tea, mulberry and other crops. It also has a good control effect on household hygiene pests such as mosquitoes and flies, as well as warehouse pests such as rice weevil and corn pirates.

Molecular Weight:220.97
XLogP3:1.4
Hydrogen Bond Acceptor Count:4
Rotatable Bond Count:4
Exact Mass:219.9459011
Monoisotopic Mass:219.9459011
Topological Polar Surface Area:44.8
Heavy Atom Count:11
Complexity:181
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes