C8H3ClO3
182.56 g/mol
Industrial ChemicalDanger
4-Chlorophthalic anhydride
CAS118-45-6EC204-251-9
Category
Industrial Chemical
Compound Class
Heterocycle
Primary Use
Chemical intermediate for dyes and pigments
4-Chlorophthalic anhydride is an organic compound used primarily as a chemical intermediate in the production of dyes and pigments. It features a chlorinated aromatic ring and anhydride functional groups, contributing to its reactivity in synthesis.
Chemical intermediate for dyesChemical intermediate for pigments
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Safety Reference
Danger
H315Causes skin irritation
H318Causes serious eye damage
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for 4-Chlorophthalic anhydride (CAS 118-45-6) is 2917.39.
HS code (international, 6-digit)
2917.39
EU CN code (8-digit)
2917 39 85
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
5-chloro-2-benzofuran-1,3-dione
InChIKey
BTTRMCQEPDPCPA-UHFFFAOYSA-N
SMILES
C1=CC2=C(C=C1Cl)C(=O)OC2=O
Synonyms (10)
- 4-Chlorophthalic anhydride
- 5-chlorophthalic anhydride
- P-CHLOROPHTHALIC ANHYDRIDE
- PHTHALIC ANHYDRIDE, 4-CHLORO-
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