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H5126

Sigma-Aldrich

2-(4-Hydroxyphenylazo)benzoic acid

≥90% (HPLC)

Synonym(s):

2-(4′-Hydroxybenzeneazo)benzoic acid, 4′-Hydroxyazobenzene-2-carboxylic acid, HABA, HBABA

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About This Item

Linear Formula:
HOC6H4N=NC6H4CO2H
CAS Number:
1634-82-8
Molecular Weight:
242.23
Beilstein:
1842696
EC Number:
216-655-2
MDL number:
MFCD00002428
UNSPSC Code:
12352100
PubChem Substance ID:
57654257
NACRES:
NA.22

Quality Level

200

Assay

≥90% (HPLC)

mp

204-208 °C (lit.)

solubility

ethanol: 20 mg/mL, clear to hazy, orange to very deep orange

SMILES string

Oc1ccc(cc1)\N=N\c2ccccc2C(O)=O

InChI

1S/C13H10N2O3/c16-10-7-5-9(6-8-10)14-15-12-4-2-1-3-11(12)13(17)18/h1-8,16H,(H,17,18)/b15-14+

InChI key

DWQOTEPNRWVUDA-CCEZHUSRSA-N

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Application

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

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
BCCF0684
BCCD4366
BCCD3746
BCBV7265
BCBG5712V

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Multifunctional polybenzoxazine nanocomposites containing photoresponsive azobenzene units, catalytic carboxylic acid groups, and pyrene units capable of dispersing carbon nanotubes.
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Journal of the American Chemical Society, 126(21), 6599-6607 (2004-05-27)
Shell cross-linked nanoparticles (SCKs) presenting surface- and bioavailable biotin functional groups were synthesized via a mixed micelle methodology, whereby co-micellization of chain terminal biotinylated poly(acrylic acid)-b-poly(methyl acrylate) (PAA-b-PMA) and nonbiotinylated PAA-b-PMA were cross-linked in an intramicellar fashion within the shell
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Chicken avidin is a key component used in a wide variety of biotechnological applications. Here we present a circularly permuted avidin (cpAvd4-->3) that lacks the loop between beta-strands 3 and 4. Importantly, the deletion of the loop has a positive
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The chicken genome encodes several biotin-binding proteins, including avidin and avidin-related protein 4 (AVR4). In addition to D-biotin, avidin binds an azo dye compound, 4-hydroxyazobenzene-2-carboxylic acid (HABA), but the HABA-binding properties of AVR4 are not yet known. Differential scanning calorimetry
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