C4H8O
72.11 g/mol
Flavor & FragranceDanger
2-Methylpropanal
CAS78-84-2EC201-149-6
Category
Flavor & Fragrance
Compound Class
Other
Primary Use
Flavoring agent and chemical intermediate
2-Methylpropanal is a clear, colorless liquid with a pungent odor. It is less dense than water, insoluble in water, and its vapors are heavier than air.
Flavoring agent in foodsChemical intermediate for synthesis of pantothenic acid, amino acids, cellulose esters, perfumes, and resinsIntermediate for rubber antioxidants and gasoline additives
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
Trans-β-ionone
CAS79-77-6
fragrance and flavor ingredient
ReferenceSame Category
Camphene
CAS79-92-5
Fragrance and flavoring agent
ReferenceSame Category
2-(Propan-2-yloxy)ethyl 2-hydroxybenzoate
CAS79915-74-5
Fragrance ingredient in personal care
ReferenceSame Category
(+/-)-α-terpinyl acetate
CAS80-26-2
Fragrance ingredient
Safety Reference
Danger
H225Highly flammable liquid and vapour
H319Causes serious eye irritation
H302Harmful if swallowed
H320Causes eye irritation
H335May cause respiratory irritation
H373May cause damage to organs through prolonged or repeated exposure
H402Harmful to aquatic life
H341Suspected of causing genetic defects
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for 2-Methylpropanal (CAS 78-84-2) is 2912.19.
HS code (international, 6-digit)
2912.19
EU CN code (8-digit)
2912 19 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
2-methylpropanal
InChIKey
AMIMRNSIRUDHCM-UHFFFAOYSA-N
SMILES
CC(C)C=O
Synonyms (35)
- 2-Methyl-1-propanal
- 2-Methylpropanal
- 2-Methylpropionaldehyde
- 2-methyl-propan-1-one
- 2-methylpropanal (isobutanal)
- 2-methypropanal
- Butyric iso aldehyde
- FEMA 2220
- ISO-BUTYRALDEHYDE
- Isobutaldehyde
- Isobutanal
- Isobutylaldehyde
- Isobutyral
- Isobutyraldehyd
- Isobutyraldehyd [Czech]
- Isobutyraldehyde (natural)
- Isobutyraldehyde, dry
- Isobutyraldehyde, redistilled
- Isobutyric aldehyde
- Isobutyryl aldehyde
- Isopropylaldehyde
- Isopropylformaldehyde
- Methylpropanal
- Propanal, 2-methyl-
- Propionaldehyde, 2-methyl-
- Valine aldehyde
- alpha-Methylpropionaldehyde
- i-butanal
- i-butyraldehyde
- isobutyraldehye
- so-Butyl aldehyde
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