2-Chloro-4-cyanopyridine synthesis
- Product Name:2-Chloro-4-cyanopyridine
- CAS Number:33252-30-1
- Molecular formula:C6H3ClN2
- Molecular Weight:138.55
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Yield:33252-30-1 117.5 g
Reaction Conditions:
with triethylamine;trichlorophosphate in 1,2-dichloro-ethane; for 4 h;
Steps:
In a 1000ml reaction flask,Add 4-cyanopyridine-N-oxide 120g,1,2-dichloroethane 360ml,Phosphorus oxychloride 183.6g,Cool the reaction system to -2±2°C,Triethylamine 151.5g was added dropwise.The dripping time is 2h. After the dripping is completed, the incubation time is 2h. After the reaction is completed,The reaction solution was concentrated until no more fractions flowed out.Add 240ml water,Stirring,There are a lot of solids out,Suction filtrationThe filter cake is rinsed with water.dry,117.5g of white solidThat is 2-chloro-4-cyanopyridine.
References:
CN104945383,2017,B Location in patent:Paragraph 0031; 0035; 0036
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