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Heterocyclic building blocks

Quinoxaline

Also known as 1,4-Benzodiazine, Benzoparadiazine, Benzopyrazine

CAS 91-19-0Formula C8H6N2Molar mass 130.15 g/molEC 202-047-4
GHS signal word: Warning. Pictograms: Harmful or irritant 85 suppliers listed
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Quinoxaline chemical structure, C8H6N2, CAS 91-19-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
91-19-0
Formula
C8H6N2
Molar mass
130.15 g/mol
EC number
202-047-4
HS code
293399
Category
Heterocyclic building blocks

What is Quinoxaline?

Plain description, key identifiers and synonyms

Quinoxaline is a naphthyridine in which the nitrogens are at positions 1 and 4. It is a mancude organic heterobicyclic parent, a naphthyridine and an ortho-fused heteroarene.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
quinoxaline
CAS number
91-19-0 CAS number cross-checked
EC number
202-047-4
Molecular formula
C8H6N2
UNII
QM4AR6M6T8
MDL number
MFCD00006719
InChIKey
XSCHRSMBECNVNS-UHFFFAOYSA-N
InChI
InChI=1S/C8H6N2/c1-2-4-8-7(3-1)9-5-6-10-8/h1-6H
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)N=CC=N2

Synonyms

  • 1,4-Benzodiazine
  • Benzoparadiazine
  • Benzopyrazine
  • Phenopiazine
  • Phenpiazine
  • Quinazine
  • 1,4-Diazanaphthalene
  • Benzo[a]pyrazine
  • 1,4-Naphthyridine
  • USAF EK-7094
  • Chinoxalin
  • Benzo(a)pyrazine
  • 1,4-Quinoxaline
  • Quinoxaline, analytical standard
  • doi:10.14272/XSCHRSMBECNVNS-UHFFFAOYSA-N.1
  • Quinoxalines
  • Quinoxaline, 99%
  • Quinoxaline (8CI,9CI)
  • Quinoxaline, >=95.0%
  • 10.14272/Xschrsmbecnvns-uhfffaoysa-n.1
  • doi:10.14272/XSCHRSMBECNVNS-UHFFFAOYSA-N.2

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
130.15 g/molcalc.
Exact mass
130.0531 Dacalc.
LogP (octanol/water)
1.63calc.
Topological polar surface area
25.78 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
10calc.
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, c1ccc2nccnc2c1

c1ccc2nccnc2c1

2 rings, 10 atoms. This chemical is the scaffold itself.

2,016 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off 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.

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

Quinoxaline suppliers

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All 85 suppliers
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Where suppliers are based

85 suppliers in 15 countries

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Quinoxaline price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Functional uses

  • Flavouring and nutrient

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Quinoxaline is traded under.

HS 2933.99Indicative HS code

Heterocyclic compounds with nitrogen hetero-atom(s) only, other

World exports in 2024
$12.1B
−31.0% vs 2023, imports $28.8B
2019 to 2024
Top exporters
  1. China30.5%
  2. India * partner reported16.3%
  3. Ireland9.0%
Top importers
  1. Slovenia31.7%
  2. Italy24.2%
  3. United States5.0%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Quinoxaline, based on the data on this page

What is Quinoxaline?

Quinoxaline is a naphthyridine in which the nitrogens are at positions 1 and 4. It is a mancude organic heterobicyclic parent, a naphthyridine and an ortho-fused heteroarene.

What is the CAS number of Quinoxaline?

The CAS registry number of Quinoxaline is 91-19-0.

What is the molecular formula and weight of Quinoxaline?

The molecular formula of Quinoxaline is C8H6N2 and its molar mass is 130.15 g/mol.

What is Quinoxaline used for?

Known uses and roles of Quinoxaline include building blocks in research and laboratory, screening compounds in research and laboratory and flavouring and nutrient.

Is Quinoxaline hazardous?

Quinoxaline carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Quinoxaline?

Quinoxaline is usually classified under HS code 293399 (Heterocyclic compounds with nitrogen hetero-atom(s) only, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Quinoxaline?

CompoundList lists 85 suppliers of Quinoxaline in United States, China, Germany, United Kingdom and 11 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Quinoxaline?

Suppliers quote Quinoxaline 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 Quinoxaline

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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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