C5H8O
84.12 g/mol
Pharmaceutical IntermediateDanger
3,4-Dihydro-2H-pyran
CAS110-87-2EC203-810-4
Category
Pharmaceutical Intermediate
Compound Class
Heterocycle
Primary Use
Pharmaceutical Intermediate
3,4-Dihydro-2H-pyran is a clear, colorless liquid with an ethereal odor. It is less dense than water and has a vapor that is heavier than air.
pharmaceutical intermediateorganic synthesis reagent
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
H225Highly flammable liquid and vapour
H315Causes skin irritation
H317May cause an allergic skin reaction
H319Causes serious eye irritation
H402Harmful to aquatic life
H412Harmful to aquatic life with long lasting effects
Customs Tariff Classification
The international HS code for 3,4-Dihydro-2H-pyran (CAS 110-87-2) is 2932.99.
HS code (international, 6-digit)
2932.99
EU CN code (8-digit)
2932 99 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
3,4-dihydro-2H-pyran
InChIKey
BUDQDWGNQVEFAC-UHFFFAOYSA-N
SMILES
C1CC=COC1
Synonyms (34)
- .delta.(Sup2)-Dihydropyran
- .delta.2-Dihydropyran
- 1,2-Pyran, 3,4-dihydro-
- 2,3-DIHYDRO-GAMMA-PYRAN
- 2,3-Dihydro-4H-pyran
- 2,3-Dihydropyran
- 2,3-dihydro-4H-pyrane
- 2,3-dihydropyrane
- 2,3-dihyropyran
- 2,4-dihydropyran
- 2-PYRAN, 3,4-DIHYDRO-
- 2H-3,4-Dihydropyran
- 2H-Pyran, 3,4-dihydro-
- 2H-Pyran, dihydro-
- 3,4-Dihdro-2H-pyrane
- 3,4-Dihydro-2-pyran
- 3,4-Dihydro-2H-pyran
- 3,4-Dihydropyran
- 3,4-dihydro-1H-pyran
- 3,4-dihydro-2H-pyrane
- 3,4-dihydropyrane
- 3,4-dihyro-2H-pyran
- 4,5-dihydropyran
- 5,6-Dihydro-4H-pyran
- Dihydro-2h-pyran, 3,4-
- Dihydropyran (VAN)
- Pyran, 2,3-dihydro-
- Pyran, dihydro-
- dihydropyrane
- dihyrdopyran
- dihyropyran
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