2-Hydroxy-4-quinolincarboxylic acid Chemical Properties

Melting point:

350°C

Boiling point:

403.6±45.0 °C(Predicted)

Density 

1.429±0.06 g/cm3(Predicted)

vapor pressure 

0Pa at 25℃

storage temp. 

Sealed in dry,Room Temperature

solubility 

DMSO (Slightly), Methanol (Slightly, Sonicated)

form 

Solid

pka

2.76±0.20(Predicted)

color 

Yellow to Dark Yellow

BRN 

148331

InChI

InChI=1S/C10H7NO3/c12-9-5-7(10(13)14)6-3-1-2-4-8(6)11-9/h1-5H,(H,11,12)(H,13,14)

InChIKey

MFSHNFBQNVGXJX-UHFFFAOYSA-N

SMILES

N1C2=C(C=CC=C2)C(C(O)=O)=CC1=O

LogP

0.3 at 25℃ and pH7

CAS DataBase Reference

15733-89-8(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xi,Xn

Risk Statements 

36/37/38-22

Safety Statements 

26-36

RTECS 

GD3869000

HazardClass 

IRRITANT

HS Code 

29337900

Toxicity

mouse,LD,intraperitoneal,> 500mg/kg (500mg/kg),"Summary Tables of Biological Tests," National Research Council Chemical-Biological Coordination Center. Vol. 5, Pg. 338, 1953.

MSDS

• Language:English Provider:ALFA

2-Hydroxy-4-quinolincarboxylic acid Usage And Synthesis

Chemical Properties

Solid

Uses

1,?2-?Dihydro-?2-?oxo-4-?quinolinecarboxylic Acid is a chemical constituent of vinegar Schisandra chinensis and is used as a indicator reagent in marking security documents.

Definition

ChEBI: 2-oxo-1,2-dihydroquinoline-4-carboxylic acid is a quinolinemonocarboxylic acid. It is a conjugate acid of a 2-oxo-1,2-dihydroquinoline-4-carboxylate.

Synthesis

1. Add 400kg of recovered glacial acetic acid to the 1000L reactor and start stirring. 2. 100kg of indigo, 160kg of malonic acid and 15kg of sodium acetate were added sequentially to the reactor to ensure adequate mixing. 3. The reaction mixture was heated to reflux and the reflux reaction was maintained for 6 hours. 4. Upon completion of the reaction, the acetic acid was removed by distillation under reduced pressure. 5. 300 kg of deionized water was added to the reaction mixture and stirred to promote crystal formation. 6. 6. The solid product was collected by filtration, washed with 30 kg of cold glacial acetic acid, and then rinsed with 30 kg of cold methanol to obtain the wet product of 2-quinolinone-4-carboxylic acid. 7. The wet product was dried at 45-70 °C for 24 h. 125 kg of 2-quinolinone-4-carboxylic acid was finally obtained with a yield of 97.3% and a liquid phase purity of 99.6%.

References

[1] Patent: CN108101842, 2018, A. Location in patent: Paragraph 0021; 0023
[2] Synthetic Communications, 2005, vol. 35, # 17, p. 2243 - 2250
[3] Patent: WO2013/153357, 2013, A1. Location in patent: Page/Page column 44
[4] Patent: US2015/45354, 2015, A1. Location in patent: Paragraph 0271-0274
[5] Chemische Berichte, 1914, vol. 47, p. 358

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