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Impurities and reference standards

Phthalazine

Also known as 2,3-Benzodiazine, Benzo[d]pyridazine, 2,3-Diazanaphthalene

CAS 253-52-1Formula C8H6N2Molar mass 130.15 g/molEC 205-963-2
GHS signal word: Warning. Pictograms: Serious health hazard 16 suppliers listed
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Phthalazine chemical structure, C8H6N2, CAS 253-52-1
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
253-52-1
Formula
C8H6N2
Molar mass
130.15 g/mol
EC number
205-963-2
HS code
293399
Category
Impurities and reference standards

What is Phthalazine?

Plain description, key identifiers and synonyms

Phthalazine is an azaarene that is the 2,3-diaza analogue of naphthalene. The parent of the class of phthalazines. It is a mancude organic heterobicyclic parent, a member of phthalazines, an azaarene and an ortho-fused heteroarene.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
phthalazine
CAS number
253-52-1 CAS number cross-checked
EC number
205-963-2
Molecular formula
C8H6N2
UNII
91Y28DM24N
MDL number
MFCD00006908
InChIKey
LFSXCDWNBUNEEM-UHFFFAOYSA-N
InChI
InChI=1S/C8H6N2/c1-2-4-8-6-10-9-5-7(8)3-1/h1-6H
SMILES (canonical and isomeric)
C1=CC=C2C=NN=CC2=C1

Synonyms

  • 2,3-Benzodiazine
  • Benzo[d]pyridazine
  • 2,3-Diazanaphthalene
  • beta-Phenodiazine
  • Benzo(d)pyridazine
  • 4,5-Benzopyridazine
  • phthalazin
  • 2,3-Benzodiazine, 2,3-Diazanaphthalene, Benzo[d]pyridazine, NSC 62484, NSC 63241, ss-Phenodiazine
  • Phthalazine, 98%
  • Phthalazine Solution in Methanol, 100ug/mL
  • Phthalazine, United States Pharmacopeia (USP) Reference Standard

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, c1ccc2cnncc2c1

c1ccc2cnncc2c1

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

339 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

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

Hazard statements

  • H341Suspected of causing genetic defects.
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

Phthalazine suppliers

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

All 16 suppliers
16 of 16 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

16 suppliers in 4 countries

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Phthalazine 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

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Inactive 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 Phthalazine 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 Phthalazine is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Phthalazine?

Phthalazine is an azaarene that is the 2,3-diaza analogue of naphthalene. The parent of the class of phthalazines. It is a mancude organic heterobicyclic parent, a member of phthalazines, an azaarene and an ortho-fused heteroarene.

What is the CAS number of Phthalazine?

The CAS registry number of Phthalazine is 253-52-1.

What is the molecular formula and weight of Phthalazine?

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

Is Phthalazine hazardous?

Phthalazine carries the GHS signal word "Warning". Main hazards: suspected of causing genetic defects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Phthalazine?

Phthalazine 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 Phthalazine?

CompoundList lists 16 suppliers of Phthalazine in China, United States, Czech Republic and Germany. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Phthalazine?

Suppliers quote Phthalazine 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 Phthalazine

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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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