3,5-Diphenylpyrazole

white crystalline powder

The preparation method is to add 95% ethanol into the reaction kettle, add acetophenone, benzaldehyde under stirring, then add 30% lye, stir for 2h at room temperature, then use gas chromatography to control the end of the reaction. After the reaction, use dilute acid After neutralization to pH=7, the product is chalcone. Add 80% hydrazine hydrate to the chalcone solution under cooling conditions to control the reaction temperature not to exceed 30°C. After the addition, continue to stir for 15 minutes, and heat to distill most of it Ethanol, after standing still, the solution is divided into two layers, and the lower 3, 5-diphenylpyrazoline is put into the dehydrogenation reactor while it is hot. Add xylene to the reaction kettle, add the 3, 5-diphenylpyrazoline obtained above, immediately heat up and add sulfur in batches. As the xylene distills out, the reaction temperature continues to rise until it reaches 160°C. Keep it for 1～1.5h, slowly add the steamed xylene after cooling slightly, cool to room temperature, and filter to obtain the finished product. Or heat the chalcone ethanol solution obtained by the above method to distill out all the ethanol, add chlorobenzene while it is hot, and separate the water phase at rest to obtain the chalcone chlorobenzene solution. After analyzing the content, pass the required chlorine gas into the solution. Chlorine temperature is lower than 60℃, and the time for venting chlorine is about 1h. After Cl2 venting, heat the chlorobenzene dichlorochalcone solution to drive out unreacted chlorine, analyze the content of dichlorochalcone, and add the required amount The hydrazine hydrate and sodium hydroxide are reacted at 80°C or higher for 5 hours, and the disappearance of dichlorochalcone is controlled by chromatography to determine the end of the reaction. The water phase is separated while it is hot, and the organic phase is cooled and filtered to obtain the finished product.

Intermediate of herbicide pyrazol.

Molecular Weight:220.27
XLogP3:3.5
Hydrogen Bond Donor Count:1
Hydrogen Bond Acceptor Count:1
Rotatable Bond Count:2
Exact Mass:220.100048391
Monoisotopic Mass:220.100048391
Topological Polar Surface Area:28.7
Heavy Atom Count:17
Complexity:229
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes