3-PHENYL-1H-PYRAZOLE-5-CARBOXYLIC ACID Chemical Properties

Melting point:

238-242 °C (dec.)(lit.)

Boiling point:

496.5±33.0 °C(Predicted)

Density 

1.355±0.06 g/cm3 (20 ºC 760 Torr)

storage temp. 

Keep in dark place,Sealed in dry,Room Temperature

form 

powder to crystal

pka

3.92±0.10(Predicted)

color 

White to Light yellow to Light orange

InChI

InChI=1S/C10H8N2O2/c13-10(14)9-6-8(11-12-9)7-4-2-1-3-5-7/h1-6H,(H,11,12)(H,13,14)

InChIKey

QBPUOAJBMXXBNU-UHFFFAOYSA-N

SMILES

N1C(C2=CC=CC=C2)=CC(C(O)=O)=N1

Safety Information

Hazard Codes 

Xi,Xn

Risk Statements 

36/37/38-22

Safety Statements 

26-36

WGK Germany 

3

RTECS 

UQ6437000

HazardClass 

IRRITANT

HS Code 

2933199090

MSDS

• Language:English Provider:SigmaAldrich

3-PHENYL-1H-PYRAZOLE-5-CARBOXYLIC ACID Usage And Synthesis

Definition

ChEBI: 3-phenyl-1H-pyrazole-5-carboxylic acid is a ring assembly and a member of pyrazoles.

Synthesis

General procedure for the synthesis of 5-phenyl-1H-pyrazole-3-carboxylic acid from ethyl 5-phenylpyrazole-3-carboxylate: to a solution of ethyl 5-phenylpyrazole-3-carboxylate (3.4 g, 15.9 mmol) in methanol (40 mL) was added an aqueous sodium hydroxide solution (140 mL, 4 M). The reaction mixture was stirred at room temperature for 2 hours. The reaction mixture was concentrated under reduced pressure to remove methanol. The aqueous phase was acidified to pH=3 with aqueous hydrochloric acid (1M) and extracted with ethyl acetate. The organic phase was dried with anhydrous sodium sulfate, filtered and concentrated to give the crude product. The crude product was purified by silica gel column chromatography, and the target compound 5-phenyl-1H-pyrazole-3-carboxylic acid (2.4 g, 80.4% yield) was obtained after elution. Mass spectrum (ESI) m/z: 189.1 [M+H]+.

References

[1] Journal of Medicinal Chemistry, 2003, vol. 46, # 18, p. 3945 - 3951
[2] Patent: US2018/271846, 2018, A1. Location in patent: Paragraph 0101; 0116; 0117
[3] New Journal of Chemistry, 2011, vol. 35, # 4, p. 865 - 875
[4] Bioorganic and Medicinal Chemistry, 2014, vol. 22, # 21, p. 6209 - 6219

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