C4H6O
70.09 g/mol
Industrial ChemicalDanger
2-Butenal
CAS123-73-9EC224-030-0
Category
Industrial Chemical
Compound Class
Other
Primary Use
Synthesis of sorbic acid and other organic chemicals
Crotonaldehyde is a clear, colorless to straw-colored liquid with a strong, suffocating odor. It is highly flammable and produces toxic vapors at room temperature.
Synthesis of sorbic acidProduction of other organic chemicals (e.g., n-butyl alcohol, 2-ethylhexyl alcohol)Warning agent in fuels
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
Levulinic acid
CAS123-76-2
Flavoring agent and chemical intermediate
ReferenceSame Category
(E/Z)-azodicarbonamide
CAS123-77-3
Blowing agent for plastics
ReferenceSame Category
Dioctyl adipate
CAS123-79-5
Low-temperature plasticizer for synthetic rubbers
ReferenceSame Category
Butyl acetate
CAS123-86-4
Organic solvent for coatings and lacquers
Safety Reference
Danger
H225Highly flammable liquid and vapour
H301Toxic if swallowed
H311Toxic in contact with skin
H315Causes skin irritation
H318Causes serious eye damage
H330Fatal if inhaled
H335May cause respiratory irritation
H341Suspected of causing genetic defects
H373May cause damage to organs through prolonged or repeated exposure
H400Very toxic to aquatic life
H300Fatal if swallowed
H310Fatal in contact with skin
H340May cause genetic defects
H350May cause cancer
H401Toxic to aquatic life
H314Causes severe skin burns and eye damage
H370Causes damage to organs
H372Causes damage to organs through prolonged or repeated exposure
H411Toxic to aquatic life with long lasting effects
H317May cause an allergic skin reaction
H319Causes serious eye irritation
H351Suspected of causing cancer
H410Very toxic to aquatic life with long lasting effects
Customs Tariff Classification
The international HS code for 2-Butenal (CAS 123-73-9) 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
(E)-but-2-enal
InChIKey
MLUCVPSAIODCQM-NSCUHMNNSA-N
SMILES
C/C=C/C=O
Synonyms (51)
- (2E)-2-Butenal
- (2E)-but-2-enal
- (2E)-crotonaldehyde
- (2Z)-2-Butenal
- (E)-.BETA.-METHYLACROLEIN
- (E)-2-Butenal (~0.1% MEHQ)
- (E)-CROTONIC ALDEHYDE
- (E)-Crotonaldehyde
- (E)-Crotonaldehyde (IUPAC)
- (E)-but-2-enal
- 1-Formylpropene
- 2-Buten-1-al
- 2-Butenal
- 2-Butenal, (2E)-
- 2-Butenal, (E)-
- 2-Butenal, inhibited
- 2-Butenaldehyde
- 3-Methylacrolein
- 3-Methylacrolein, inhibited
- Aldehyde crotonique
- Aldehyde crotonique [French]
- But-(E)-2-enal
- Butenal
- CROTONALDEHYDE E-FORM
- CROTONALDEHYDE, (2E)-
- CROTONALDEHYDE, (E)-
- Crotenaldehyde
- Croton aldehyde
- Crotonal
- Crotonaldehyde, cis-
- Crotonaldehyde, inhibited
- Crotonaldehyde, stabilized
- Crotonic aldehyde
- Crotylaldehyde
- E-2-Butenal
- Krotonaldehyd
- Krotonaldehyd [Czech]
- Methylpropenal
- Propylene aldehyde
- Topanel
- Topanel CA
- beta-Methylacrolein
- t-2-Butenal
- trans- Crotonal
- trans-Crotonaldehyde
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