ChemicalBook CAS DataBase List 3-Amino-4-pyrazolecarbonitrile

3-Amino-4-pyrazolecarbonitrile synthesis

6synthesis methods

Product Name:3-Amino-4-pyrazolecarbonitrile
CAS Number:16617-46-2
Molecular formula:C4H4N4
Molecular Weight:108.1

122-51-0 Synthesis

122-51-0
494 suppliers
$10.00/5ml

109-77-3 Synthesis

109-77-3
434 suppliers
$10.00/5g

16617-46-2
489 suppliers
$6.00/5g

Yield:16617-46-2 72%

Reaction Conditions:

Stage #1:orthoformic acid triethyl ester;malononitrile with acetic anhydride at 115; for 2 h;
Stage #2: with hydrazine hydrate at 18 - 30; for 18.6667 h;

Steps:

Amino-1H-pyrazole-4-carbonitrile
Add malononitrile (16.5 g, 0.25 mol), triethyl orthoformate (38 g, 0.29 mol) and acetic anhydride (55 g,0.54 mol) to a 1 L three-necked flask, slowly heat to 115 °C, reflux reaction for 2 h .The temperature of the mixture was lowered to 20 °C,hydrazine hydrate (15.5 g, 0.31 mol) was added dropwiseover 40minutes, and the temperature was maintained at 18-22 °C.The reaction was then carried out at 20-30 ° C for 18 h.Thereaction wasmonitoredbyTLC, neutralized with a sodium hydroxide aqueous solution (36 g of sodium hydroxide in 72 ml of water) at 25 °C to obtain a prize mixture, and the mixture washeated and azeotropically distilled to collect 45 ml fractions.This fraction was cooled at 0 to 5 ° C for 1.5 h, and a pale brown solid was collected,rinsedwithcold water and dried to give product (19.2 g, 72% yield).

References:

Jiangnan University;Tang Chunlei;Cao Kai;Zhao Hui;Hu Xiaoxia;Fan Weizheng;Feng Bonian;Liao Hanyue CN108484613, 2018, A Location in patent:Paragraph 0044; 0045; 0046

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123-06-8 Synthesis