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Aromatic building blocks

Phthalonic acid

Also known as 2-Carboxy-alpha-oxobenzeneacetic acid, 2-(carboxycarbonyl)benzoic acid, 2-oxalobenzoic acid

CAS 528-46-1Formula C9H6O5Molar mass 194.14 g/molEC 196-971-4
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Phthalonic acid chemical structure, C9H6O5, CAS 528-46-1
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
528-46-1
Formula
C9H6O5
Molar mass
194.14 g/mol
EC number
196-971-4
HS code
291830
Category
Aromatic building blocks

What is Phthalonic acid?

Plain description, key identifiers and synonyms

Phthalonic acid is a chemical substance with the molecular formula C9H6O5 and a molar mass of 194.14 g/mol. Its CAS registry number is 528-46-1. The IUPAC name is 2-oxalobenzoic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-oxalobenzoic acid
CAS number
528-46-1 CAS number cross-checked
EC number
196-971-4
Molecular formula
C9H6O5
MDL number
MFCD00090830
InChIKey
LFLOMAIEONDOLV-UHFFFAOYSA-N
InChI
InChI=1S/C9H6O5/c10-7(9(13)14)5-3-1-2-4-6(5)8(11)12/h1-4H,(H,11,12)(H,13,14)
SMILES (canonical and isomeric)
C1=CC=C(C(=C1)C(=O)C(=O)O)C(=O)O

Synonyms

  • 2-Carboxy-alpha-oxobenzeneacetic acid
  • 2-(carboxycarbonyl)benzoic acid
  • 2-oxalobenzoic acid
  • Phthalonsaure
  • 2-Oxalyl-benzoic acid
  • 2-(carboxycarbonyl)benzoicacid

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
194.14 g/molcalc.
Exact mass
194.0215 Dacalc.
LogP (octanol/water)
0.65calc.
Topological polar surface area
91.67 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
3calc.
Heavy atoms
14calc.
Rings
1calc.
Aromatic rings
1calc.
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, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

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

Phthalonic acid suppliers

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Phthalonic acid 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

Use classes: Pesticide transformation products.

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 Phthalonic acid is traded under.

HS 2918.30Indicative HS code

Carboxylic acids with aldehyde or ketone function but without other oxygen function…

World exports in 2024
$813M
−39.8% vs 2023, imports $1.23B
2019 to 2024
Top exporters
  1. China43.3%
  2. India * partner reported10.4%
  3. United States6.8%
Top importers
  1. Singapore33.1%
  2. Germany7.2%
  3. Japan6.9%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Phthalonic acid, based on the data on this page

What is Phthalonic acid?

Phthalonic acid is a chemical substance with the molecular formula C9H6O5 and a molar mass of 194.14 g/mol. Its CAS registry number is 528-46-1. The IUPAC name is 2-oxalobenzoic acid.

What is the CAS number of Phthalonic acid?

The CAS registry number of Phthalonic acid is 528-46-1.

What is the molecular formula and weight of Phthalonic acid?

The molecular formula of Phthalonic acid is C9H6O5 and its molar mass is 194.14 g/mol.

What is Phthalonic acid used for?

Use classes: Pesticide transformation products.

Is Phthalonic acid hazardous?

No GHS hazard classification for Phthalonic acid is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Phthalonic acid?

Phthalonic acid is usually classified under HS code 291830 (Carboxylic acids with aldehyde or ketone function but without other oxygen function…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Phthalonic acid?

Post a free request on CompoundList and suppliers of Phthalonic acid will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Phthalonic acid?

Suppliers quote Phthalonic acid 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 Phthalonic acid

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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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