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Aromatic building blocks

3,3'-Dihydroxybenzidine

Also known as 4,4'-Diamino-3,3'-biphenyldiol, 3,3'-Dioxybenzidine, 3,3'-Dihydroxy-4,4'-diaminobiphenyl

CAS 2373-98-0Formula C12H12N2O2Molar mass 216.24 g/molEC 679-800-2
GHS signal word: Danger. Pictograms: Serious health hazard 8 suppliers listed
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3,3'-Dihydroxybenzidine chemical structure, C12H12N2O2, CAS 2373-98-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
2373-98-0
Formula
C12H12N2O2
Physical form
Crystals
Melting point
160 °C
HS code
292229
Category
Aromatic building blocks
Illustrative photo, closed white HDPE bottles and amber jars on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is 3,3'-Dihydroxybenzidine?

Plain description, key identifiers and synonyms

3,3'-dihydroxybenzidine appears as colorless crystals. (NTP, 1992)

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-amino-5-(4-amino-3-hydroxyphenyl)phenol
CAS number
2373-98-0 CAS number cross-checked
EC number
679-800-2
Molecular formula
C12H12N2O2
UNII
OJ61P3RD7H
MDL number
MFCD00039149
InChIKey
ZGDMDBHLKNQPSD-UHFFFAOYSA-N
InChI
InChI=1S/C12H12N2O2/c13-9-3-1-7(5-11(9)15)8-2-4-10(14)12(16)6-8/h1-6,15-16H,13-14H2
SMILES (canonical and isomeric)
C1=CC(=C(C=C1C2=CC(=C(C=C2)N)O)O)N

Synonyms

  • 4,4'-Diamino-3,3'-biphenyldiol
  • 3,3'-Dioxybenzidine
  • 3,3'-Dihydroxy-4,4'-diaminobiphenyl
  • 3,3'-Dwuoksybenzydyna
  • 3,3-Dihydroxybenzidine
  • Benzidine, 3,3'-dihydroxy-
  • m,m'-Biphenol, 6,6'-diamino-
  • 4,4'-diaminobiphenyl-3,3'-diol
  • 3,3'-Biphenyldiol, 4,4'-diamino-
  • (1,1'-Biphenyl)-3,3'-diol, 4,4'-diamino-
  • [1,1'-Biphenyl]-3,3'-diol, 4,4'-diamino-
  • (1,1'-Biphenyl)-4,4'-diamine, 3,3'-dihydroxy-
  • 3-13-00-02309 (Beilstein Handbook Reference)
  • Dihydroxybenzidine, 3,3'-
  • 3,3'-Dwuoksybenzydyna (polish)
  • [1,1'-Biphenyl]-4,4'-diamine, 3,3'-dihydroxy-
  • 3,3'Dioxybenzidine
  • 3,3'Dwuoksybenzydyna
  • Benzidine, 3,3'dihydroxy
  • m,m'Biphenol, 6,6'diamino
  • 4,4'Diamino3,3'biphenyldiol
  • 3,3'Biphenyldiol, 4,4'diamino
  • 3,3'Dihydroxy4,4'diaminobiphenyl
  • 6,6'-Diamino-m,m'-biphenol
  • (1,1'Biphenyl)3,3'diol, 4,4'diamino
Show all 35 synonyms
  • (1,1'Biphenyl)4,4'diamine, 3,3'dihydroxy
  • 4,4'-Diamino-(1,1'-bi-phenyl)-3,3'-diol
  • 4,4'-Diamino-[1,1'-biphenyl]-3,3'-diol
  • 2-amino-5-(4-amino-3-hydroxyphenyl)phenol
  • 4,4'-Diamino-3,3'-dihydroxybiphenyl
  • 3,3'-Dihydroxy-4,4'-diamino-biphenyl
  • Benzidine-3,3'-diol
  • 4,4'-Diamino[1,1'-biphenyl]-3,3'-diol
  • 3,3'-Dihydroxybenzidine (HAB)
  • 2-amino-5-(4-amino-3-hydroxy-phenyl)phenol

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Crystalsexp.
Melting point
160 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
216.24 g/molcalc.
Exact mass
216.0899 Dacalc.
LogP (octanol/water)
1.93calc.
Topological polar surface area
92.5 Ųcalc.
Hydrogen bond donors
4calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
1calc.
Heavy atoms
16calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccc(-c2ccccc2)cc1

c1ccc(-c2ccccc2)cc1

2 rings, 12 atoms, the Biphenyl ring system.

32,228 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H350May cause cancer.
Precautionary statements (5)
  • P203Obtain, read and follow all safety instructions before use.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P318If exposed or concerned, get medical advice.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

3,3'-Dihydroxybenzidine suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 8 suppliers
8 of 8 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

8 suppliers in 3 countries

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3,3'-Dihydroxybenzidine price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Chemical intermediate for ci direct blue 84, 95, 98, and 166.

How it is made

By acidic iron reduction of 4,4-dinitro-3,3'-biphenol

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 3,3'-Dihydroxybenzidine is traded under.

HS 2922.29Indicative HS code

Amino-naphthols and other amino-phenols, other than those containing more than one kind…

World exports in 2024
$467M
−15.3% vs 2023, imports $454M
2019 to 2024
Top exporters
  1. China63.1%
  2. India * partner reported15.5%
  3. Japan4.0%
Top importers
  1. India * partner reported25.8%
  2. United States14.4%
  3. South Korea7.6%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for 3,3'-Dihydroxybenzidine is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 3,3'-Dihydroxybenzidine, based on the data on this page

What is 3,3'-Dihydroxybenzidine?

3,3'-dihydroxybenzidine appears as colorless crystals. (NTP, 1992)

What is the CAS number of 3,3'-Dihydroxybenzidine?

The CAS registry number of 3,3'-Dihydroxybenzidine is 2373-98-0.

What is the molecular formula and weight of 3,3'-Dihydroxybenzidine?

The molecular formula of 3,3'-Dihydroxybenzidine is C12H12N2O2 and its molar mass is 216.24 g/mol.

What is 3,3'-Dihydroxybenzidine used for?

Chemical intermediate for ci direct blue 84, 95, 98, and 166.

Is 3,3'-Dihydroxybenzidine hazardous?

3,3'-Dihydroxybenzidine carries the GHS signal word "Danger". Main hazards: may cause cancer. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 3,3'-Dihydroxybenzidine?

3,3'-Dihydroxybenzidine is usually classified under HS code 292229 (Amino-naphthols and other amino-phenols, other than those containing more than one kind…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 3,3'-Dihydroxybenzidine?

CompoundList lists 8 suppliers of 3,3'-Dihydroxybenzidine in China, Japan and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of 3,3'-Dihydroxybenzidine?

Suppliers quote 3,3'-Dihydroxybenzidine on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle 3,3'-Dihydroxybenzidine

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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