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Monomers

3,3'-Dimethoxybenzidine-4,4'-diisocyanate

Also known as Dianisidine diisocyanate, 3,3'-Dimethoxy-4,4'-biphenylene diisocyanate, DADI

CAS 91-93-0Formula C16H12N2O4Molar mass 296.28 g/molEC 627-518-5
GHS signal word: Danger. Pictograms: Acute toxicity (severe)
Get quotes Safety data
3,3'-Dimethoxybenzidine-4,4'-diisocyanate chemical structure, C16H12N2O4, CAS 91-93-0
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Gray to brown powder
Melting point
112 °C
Solubility
Soluble in ketones and esters
HS code
292910
Category
Monomers
UN number
UN 2206
Illustrative photo, metallic grey powder in a steel drum in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is 3,3'-Dimethoxybenzidine-4,4'-diisocyanate?

Plain description, key identifiers and synonyms

3,3'-Dimethoxybenzidine-4,4'-diisocyanate is a member of biphenyls.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1-isocyanato-4-(4-isocyanato-3-methoxyphenyl)-2-methoxybenzene
CAS number
91-93-0 CAS number cross-checked
EC number
627-518-5
Molecular formula
C16H12N2O4
UNII
5AC9L5Y28Y
InChIKey
QZWKEPYTBWZJJA-UHFFFAOYSA-N
InChI
InChI=1S/C16H12N2O4/c1-21-15-7-11(3-5-13(15)17-9-19)12-4-6-14(18-10-20)16(8-12)22-2/h3-8H,1-2H3
SMILES (canonical and isomeric)
COC1=C(C=CC(=C1)C2=CC(=C(C=C2)N=C=O)OC)N=C=O

Synonyms

  • Dianisidine diisocyanate
  • 3,3'-Dimethoxy-4,4'-biphenylene diisocyanate
  • DADI
  • 4,4'-Diisocyanato-3,3'-dimethoxy-1,1'-biphenyl
  • 1,1'-Biphenyl, 4,4'-diisocyanato-3,3'-dimethoxy-
  • 1-isocyanato-4-(4-isocyanato-3-methoxyphenyl)-2-methoxybenzene
  • Isocyanic acid, ester with O,O'-dimethoxybiphenyl
  • 3,3'-Dimethoxy-4,4'-diphenylyl isocyanate
  • 3,3'-Dimethoxy-4,4'-biphenylylene isocyanate
  • 3,3'-Dimethoxy-4,4'-biphenylylene isocyanic acid ester
  • Isocyanic acid, 3,3'-dimethoxy-4,4'-biphenylylene ester
  • 3,3'-Dimethoxy-4,4'-diphenylene diisocyanate
  • 4,4'-diisocyanato-3,3'-dimethoxybiphenyl
  • Dimethoxybenzidine-4,4'-diisocyanate
  • Isocyanic acid, 3,3'-dimethoxy-4,4'-biphenylene ester
  • 3,3'-Dimethoxybiphenyl-4,4'-diisocyanate
  • 3,3'-dimethoxy-4,4'-biphenylenediisocyanate
  • 3,4'-biphenyl diisocyanate
  • 3,4'-diphenylyl isocyanate
  • 4-13-00-02837 (Beilstein Handbook Reference)
  • 3,4'-biphenylylene isocyanate
  • 3,3'-Dimethoxybenzidine-4,4'-diisocyanate [Diisocyanates]
  • 4,3'-dimethoxy-1,1'-biphenyl
  • Isocyanic acid,O'-dimethoxybiphenyl
  • Isocyanic acid 3,4'-biphenylene ester
Show all 34 synonyms
  • Isocyanic acid 3,4'-biphenylylene ester
  • 1, 4,4'-diisocyanato-3,3'-dimethoxy-
  • 3,3 inverted exclamation marka-Dimethoxy-4,4 inverted exclamation marka-biphenylene diisocyanate
  • 3,3'-dimethoxy-4,4'-diisocyanatobiphenyl
  • Isocyanic acid,3'-dimethoxy-4,4'-biphenylene ester
  • Dimethoxybenzidine-4,4'-diisocyanate, 3,3'-
  • Isocyanic acid 3,3'-dimethoxy-4,4'-biphenylene ester
  • Isocyanic acid,3'-dimethoxy-4,4'-biphenylylene ester
  • 3,3'-Dimethoxy-4,4'-biphenylene diisocyanate, 85%, technical grade

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

Appearance
Gray to brown powderexp.
Melting point
112 °Cexp.
Solubility
Soluble in ketones and estersexp.

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
296.28 g/molcalc.
Exact mass
296.0797 Dacalc.
LogP (octanol/water)
3.31calc.
Topological polar surface area
77.32 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
6calc.
Rotatable bonds
5calc.
Heavy atoms
22calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.13calc.
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
GHS06: Acute toxicity (severe)
Acute toxicity (severe)

Hazard statements

  • H301Toxic if swallowed.
  • H311Toxic in contact with skin.
  • H331Toxic if inhaled.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2206

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

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3,3'-Dimethoxybenzidine-4,4'-diisocyanate price

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Uses and applications

What the substance is used for, by industry and function

Polymers and adhesive systems, high strength backbone or cross-linking intermediate.

How it is made

3,3'-Dimethoxybenzidine-4,4'-diisocyanate has been prepared by the reaction of dimethoxybenzidine dihydrochloride with phosgene in an aromatic solvent.

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'-Dimethoxybenzidine-4,4'-diisocyanate is traded under.

HS 2929.10Indicative HS code

Isocyanates

World exports in 2024
$5.02B
−11.5% vs 2023, imports $4.75B
2019 to 2024
Top exporters
  1. China21.4%
  2. South Korea16.3%
  3. Germany12.4%
Top importers
  1. China7.4%
  2. India * partner reported6.3%
  3. Brazil5.9%

* Partner reported figures, a lower bound.

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

The HS code shown for 3,3'-Dimethoxybenzidine-4,4'-diisocyanate 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'-Dimethoxybenzidine-4,4'-diisocyanate, based on the data on this page

What is 3,3'-Dimethoxybenzidine-4,4'-diisocyanate?

3,3'-Dimethoxybenzidine-4,4'-diisocyanate is a member of biphenyls.

What is the CAS number of 3,3'-Dimethoxybenzidine-4,4'-diisocyanate?

The CAS registry number of 3,3'-Dimethoxybenzidine-4,4'-diisocyanate is 91-93-0.

What is the molecular formula and weight of 3,3'-Dimethoxybenzidine-4,4'-diisocyanate?

The molecular formula of 3,3'-Dimethoxybenzidine-4,4'-diisocyanate is C16H12N2O4 and its molar mass is 296.28 g/mol.

What is 3,3'-Dimethoxybenzidine-4,4'-diisocyanate used for?

Polymers and adhesive systems, high strength backbone or cross-linking intermediate.

Is 3,3'-Dimethoxybenzidine-4,4'-diisocyanate hazardous?

3,3'-Dimethoxybenzidine-4,4'-diisocyanate carries the GHS signal word "Danger". Main hazards: toxic if swallowed, toxic in contact with skin, toxic if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 3,3'-Dimethoxybenzidine-4,4'-diisocyanate?

3,3'-Dimethoxybenzidine-4,4'-diisocyanate is usually classified under HS code 292910 (Isocyanates). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 3,3'-Dimethoxybenzidine-4,4'-diisocyanate?

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What is the price of 3,3'-Dimethoxybenzidine-4,4'-diisocyanate?

Suppliers quote 3,3'-Dimethoxybenzidine-4,4'-diisocyanate on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

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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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