5-AMINO-3-ETHYL-1H-PYRAZOLE Chemical Properties

Boiling point:

313.8±22.0 °C(Predicted)

Density 

1.126 g/mL at 25 °C

refractive index 

1.5420

Flash point:

>110℃

storage temp. 

Keep in dark place,Sealed in dry,Store in freezer, under -20°C

form 

solid

pka

15.84±0.10(Predicted)

Appearance

Light yellow to yellow Liquid

InChI

InChI=1S/C5H9N3/c1-2-4-3-5(6)8-7-4/h3H,2H2,1H3,(H3,6,7,8)

InChIKey

AXDGPQLEVYSXNL-UHFFFAOYSA-N

SMILES

N1C(CC)=CC(N)=N1

Safety Information

Hazard Codes 

Xn

Risk Statements 

22-36/37/38

Safety Statements 

23-26-36/37/39

WGK Germany 

3

HazardClass 

IRRITANT

HS Code 

2933199090

5-AMINO-3-ETHYL-1H-PYRAZOLE Usage And Synthesis

Uses

3-Amino-5-ethyl-1H-pyrazole is an important raw material and intermediate used in organic synthesis, pharmaceuticals, agrochemicals and dyestuff.

Definition

ChEBI: 3-Amino-5-ethyl-1H-pyrazole is a dicarboximide and a heterocyclic compound.

Synthesis

GENERAL STEPS: 3-Oxopentanenitrile (XXXV; 2 g; 21 mmol) was dissolved in ethanol (60 mL) under stirring conditions, followed by the addition of hydrazine hydrate (1.3 mL; 41 mmol). The reaction mixture was heated to reflux for 12 hours. Upon completion of the reaction, the mixture was cooled to room temperature and concentrated under reduced pressure. The crude product was purified by column chromatography (eluent: 8% methanol-dichloromethane) to afford 5-ethyl-1H-pyrazol-3-amine (XXXVI; 1.8 g; 78% yield) as a brown viscous solid. The structure of the product was confirmed by 1H NMR (400 MHz, DMSO-d6): δ 11.0 (broad single peak, 1H), 5.17 (single peak, 1H), 4.5 (broad single peak, 2H), 2.4 (multiple peaks, 2H), and 1.1 (triple peak, 3H). Mass spectrometry analysis showed a molecular ion peak (M+1) of 111.93.

References

[1] Patent: WO2015/97122, 2015, A1. Location in patent: Page/Page column 92
[2] Patent: WO2007/99326, 2007, A1. Location in patent: Page/Page column 114

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