2-(4-Hydroxyphenylazo)benzoic acid Chemical Properties

Melting point:

204-208 °C(lit.)

Boiling point:

385.05°C (rough estimate)

Density 

1.2480 (rough estimate)

refractive index 

1.5300 (estimate)

storage temp. 

Store below +30°C.

solubility 

ethanol: 20 mg/mL, clear

pka

3.40±0.36(Predicted)

form 

powder to crystal

color 

Light yellow to Brown

BRN 

1842696

Stability:

Stable. Incompatible with strong oxidizing agents.

CAS DataBase Reference

1634-82-8(CAS DataBase Reference)

EPA Substance Registry System

Benzoic acid, 2-[(4-hydroxyphenyl)azo]- (1634-82-8)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

3

Hazard Note 

Irritant

TSCA 

Yes

HS Code 

29270000

MSDS

• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

2-(4-Hydroxyphenylazo)benzoic acid Usage And Synthesis

Chemical Properties

light yellow to orange powder

Uses

2-(4-Hydroxyphenylazo)benzoic acid may be used in the preparation of:

• 2-((4-(3,4-dicyanophenoxy)phenyl)diazenyl)benzoic acid
• 2,2′-((((4,5-dicyano-1,2-phenylene)bis(oxy))bis(4,1-phenylene))bis(diazene-2,1-diyl)) dibenzoic acid
• a multifunctional benzoxazine monomer

Definition

ChEBI: An azo compound that is azobenzene in which one phenyl group is substituted at position 4 by a hydroxy group, while the other phenyl group is substituted at position 2 by a carboxy group. It is used as a matrix in matrix-assisted laser desorption/ionizatio (MALDI) mass spectrometry.

General Description

2-(4-Hydroxyphenylazo)benzoic acid) (HABA), can be used for desorption of proteins, peptides and glycoproteins, thereby making it very advantageous for matrix-assisted laser desorption ionization mass spectrometry.

2-(4-Hydroxyphenylazo)benzoic acid(1634-82-8)Related Product Information

• 4-PHENYLAZOPHENOL
• 2-Aminobenzyl alcohol
• CYCLOHEXYLAMINE BENZOATE
• Azobenzene
• Anthranilic acid
• 4-Aminophenol
• sodium 2-[(4-hydroxyphenyl)azo]benzoate
• Ammonium benzoate
• ANILINE ACETATE
• 2-(4-Hydroxyphenylazo)benzoic acid
• SALOR-INT L202924-1EA