C8H3ClO3
182.56 g/mol
Pharmaceutical IntermediateDanger
3-Chlorophthalic anhydride
CAS117-21-5EC204-179-8
Category
Pharmaceutical Intermediate
Compound Class
Halocarbon
Primary Use
Pharmaceutical Intermediate
3-Chlorophthalic anhydride is a chlorinated derivative of phthalic anhydride used as a building block in pharmaceutical synthesis. It features a fused aromatic ring system with anhydride and halogen functional groups, contributing to its reactivity in organic chemistry.
Pharmaceutical intermediate for synthesis
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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Referencesame scaffold
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4-chlorophthalic anhydride
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Referencesame scaffold
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Referencesame scaffold
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Safety Reference
Danger
H301Toxic if swallowed
H315Causes skin irritation
H318Causes serious eye damage
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for 3-Chlorophthalic anhydride (CAS 117-21-5) 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
4-chloro-2-benzofuran-1,3-dione
InChIKey
UERPUZBSSSAZJE-UHFFFAOYSA-N
SMILES
C1=CC2=C(C(=C1)Cl)C(=O)OC2=O
Synonyms (11)
- 3-Chlorophthalic anhydride
- Phthalic anhydride, 3-chloro-
- chlorophthalic anhydride
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