C8H8O3
152.15 g/mol
Industrial ChemicalDanger
1,2,3,6-Tetrahydrophthalic anhydride
CAS85-43-8EC201-605-4
Category
Industrial Chemical
Compound Class
Ester
Primary Use
Intermediate for alkyds, polyesters, plasticizers
1,2,3,6-Tetrahydrophthalic anhydride is an organic compound that exists primarily as the cis isomer. It is a white solid soluble in organic solvents, used as an intermediate in the production of alkyds, polyesters, and plasticizers.
Intermediate for alkydsIntermediate for polyestersIntermediate for plasticizers
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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Related Compounds
ReferenceSame Category
Phthalic anhydride
CAS85-44-9
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ReferenceSame Category
Sodium bis(2,2-methylene-bis(4,6-di-tert-butylphenyl)phosphate)
CAS85209-91-2
plastic additive nucleating agent
Referencestereoisomer of
Cis-tetrahydrophthalic anhydride
CAS935-79-5
Chemical intermediate for resins and polymers
Referencesame scaffold
Methyltetrahydrophthalic anhydride
CAS26590-20-5
Hardener in epoxy resin systems
Safety Reference
Danger
H317May cause an allergic skin reaction
H318Causes serious eye damage
H334May cause allergy or asthma symptoms or breathing difficulties if inhaled
H412Harmful to aquatic life with long lasting effects
H302Harmful if swallowed
H315Causes skin irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for 1,2,3,6-Tetrahydrophthalic anhydride (CAS 85-43-8) is 2917.20.
HS code (international, 6-digit)
2917.20
EU CN code (8-digit)
2917 20 00
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
3a,4,7,7a-tetrahydro-2-benzofuran-1,3-dione
InChIKey
KMOUUZVZFBCRAM-UHFFFAOYSA-N
SMILES
C1C=CCC2C1C(=O)OC2=O
Synonyms (38)
- THPA
- 1, 3a,4,7,7a-tetrahydro-
- 4-Cyclohexene-1, trans-
- Rikacid TH
- Rikacid THPA
- Tetrahydroftalanhydrid
- Tetrahydrophthalic anhydrides
- tetrahydrophthalic anhydride
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