CROTONALDEHYDE

Crotonaldehyde is water-white (turns paleyellow on contact with air) with an irritating, pungent, suffocating odor.
Crotonaldehyde can turn pale yellow when it contacts air. 
Crotonaldehyde has a molecular weight of 70.1, a boiling point of 219°F, and a freezing point of -101°F. 

CAS Number: 123-73-9
Molecular Formula: C4H6O
Molecular Weight: 70.09
EINECS Number: 204-647-1

Synonyms: CROTONALDEHYDE, 2-Butenal, Crotonal, Crotylaldehyde, (E)-but-2-enal, (2E)-but-2-enal, Crotonic aldehyde, Methylpropenal, 1-Formylpropene, beta-Methylacrolein, Propylene aldehyde, 2-Butenaldehyde, Krotonaldehyd, beta-Methyl acrolein, 4170-30-3, RCRA waste number U053, trans-2-butenaldehyde, UN 1143, AI3-18303 (USDA), CHEBI:41607, DTXCID404864, 9G72074TUW, DTXSID8024864, 3-Methylacrolein, NSC-56354, RefChem:5709, 224-030-0, 123-73-9, trans-Crotonaldehyde, (E)-Crotonaldehyde, trans-2-Butenal, 2-Butenal, (2E)-, Aldehyde crotonique, Topanel, trans- Crotonal, Topanel CA, 2-Butenal, (E)-, trans-but-2-enal, E-2-Butenal, CROTONALDEHYDE, (E)-, 2-Butenal, inhibited, (E)-Crotonaldehyde (IUPAC), Crotonaldehyde, inhibited, NCI-C56279, 3-Methylacrolein, inhibited, NSC 56354, RCRA waste no. U053, CHEMBL1086445, MFCD00007003, 6PUW625907, Butenal, Krotonaldehyd [Czech], trans-Crotonaldehyde; trans-2-Butenal, (E)-2-Butenal (~0.1% MEHQ), .beta.-Methylacrolein, (2Z)-2-Butenal, Aldehyde crotonique [French], CCRIS 909, CCRIS 4501, Crotonaldehyde, cis-, HSDB 252, 2-Buten-1-al, HSDB 2871, (2E)-2-Butenal, EINECS 204-647-1, EINECS 224-030-0, UN1143, Crotenaldehyde, Croton aldehyde, UNII-9G72074TUW, AI3-18303, UNII-6PUW625907, t-2-Butenal, nchem.215-comp8, (2E)-crotonaldehyde, But-(E)-2-enal, Crotonaldehyde, stabilized, Epitope ID:143635, Crotonaldehyde, stabilized [UN1143] [Poison], EC 224-030-0, SCHEMBL38449, (E)-CROTONIC ALDEHYDE, SCHEMBL229109, GTPL6288, SCHEMBL2400938, CROTONALDEHYDE, (2E)-, DTXSID6020351, Crotonaldehyde, predominantly trans, (E)-.BETA.-METHYLACROLEIN, (E)-CROTONALDEHYDE [HSDB], CROTONALDEHYDE E-FORM [MI], STR00019, Tox21_200316, BDBM50318489, AKOS005720774, DB04381, 2-BUTENAL (TRANS) CROTONALDEHYDE, MSK002097-1000A, NCGC00090830-01, NCGC00090830-02, NCGC00257870-01, Crotonaldehyde, predominantly trans, 98%, CAS-4170-30-3, CS-0015768, NS00068728, C19377, Crotonaldehyde, stabilized [UN1143] [Poison], Q416036, trans-Crotonaldehyde Solution in Acetonitrile, 1000ug/mL, Crotonaldehyde, predominantly trans, >=99%, contains 0.1-0.2% BHT as stabilizer, 1% H2O as stabilizer, crotonaldehyde,(e)-00;E-Crotonaldehyde;NCI-C56279;Topanel;Topanel CA;CROTONALDEHYDE, 90%, PREDOMINANTLY TRANS;CROTONALDEHYDE STABILIZED;CROTONALDEHYDE, 98%, PREDOMINANTLY TRANS

Crotonaldehyde may be incompatible with caustics, ammonia, strong oxidizers, nitric acid, and amines. 
Crotonaldehyde also has the ability to polymerize at high temperatures.
Crotonaldehyde, also known as 2-butenal, crotonal, crotonic aldehyde, crotylaldehyde, and β-methylacrolein, is an unsaturated aliphatic aldehyde containing a four-carbon chain with a carbon-carbon double bond conjugated with the aldehyde group.

Crotonaldehyde is commonly encountered predominantly in its trans or E form, although cis or Z-crotonaldehyde is also a recognized stereoisomer with the same molecular formula and a different spatial arrangement around the carbon-carbon double bond.
Crotonaldehyde conjugated aldehyde structure gives crotonaldehyde a distinctive chemical character and makes it a reactive building block for further organic transformations. 

Crotonaldehyde has the molecular formula C₄H₆O and a molecular weight of approximately 70.09 g/mol, corresponding to the simple structure CH₃CH=CHCHO.
Crotonaldehydes conjugated carbonyl and alkene groups form an α,β-unsaturated aldehyde system, in which the carbon-carbon double bond is directly connected to the aldehyde-containing portion of the molecule.
This structural arrangement is responsible for much of the compound's characteristic reactivity and distinguishes crotonaldehyde from saturated aldehydes such as butyraldehyde. 

The aldehyde group makes crotonaldehyde an electrophilic compound capable of participating in a variety of organic reactions, while the adjacent carbon-carbon double bond provides an additional reactive site within the same molecule.
As an α,β-unsaturated aldehyde, it can undergo reactions at the carbonyl group as well as transformations involving the conjugated double-bond system.
Crotonaldehyde combination of functional groups gives crotonaldehyde considerably more synthetic versatility than a simple four-carbon saturated aldehyde.

The conjugated structure also influences the way crotonaldehyde interacts with other chemical substances during processing and synthesis.
Crotonaldehydes carbonyl group can participate in nucleophilic addition and condensation reactions, while the conjugated alkene can undergo reactions characteristic of α,β-unsaturated compounds.
Consequently, the molecule can serve as a useful starting point when a synthesis requires a small aldehyde containing both carbonyl and carbon-carbon unsaturation.

Crotonaldehyde exists as E and Z stereoisomers, with the trans or E form being the form most commonly identified in commercial and technical references.
The E configuration places the larger substituents on opposite sides of the carbon-carbon double bond, producing a different molecular geometry from the corresponding Z isomer.
This distinction is important when interpreting analytical data or comparing specifications because the two stereoisomers have separate chemical identities even though they share the same molecular formula. 

Crotonaldehyde is a relatively small and volatile organic molecule, and its physical behavior is closely connected to its low molecular mass and aldehyde functionality.
It is described as a clear, colorless to straw-colored liquid with a pronounced, pungent odor that can be readily noticed even at relatively low concentrations.
Crotonaldehydes volatility and strong odor are characteristic considerations when the substance is handled in open or poorly controlled environments. 

Crotonaldehyde has a boiling point of approximately 104–105 °C and a melting point around −74 °C, which means that it remains liquid under ordinary ambient conditions.
Its density is below that of water, while its reported water solubility is substantially higher than might be expected for a small unsaturated aldehyde, with approximately 150 g/L reported at 20 °C.
Crotonaldehyde is also soluble in common organic solvents including acetone, benzene, diethyl ether, and ethanol. 

The chemical stability of crotonaldehyde requires particular attention because the compound can undergo dimerization, oxidation, and polymerization under suitable conditions.
Pure crotonaldehyde can dimerize, while oxidation can lead to the formation of crotonic acid, and polymerization may occur under the influence of heat or certain reactive contaminants.
For this reason, commercial material is commonly supplied in stabilized form to reduce the likelihood of unwanted reactions during storage and handling. 

The presence of the conjugated aldehyde system also gives crotonaldehyde a characteristic spectroscopic profile that can be used for analytical identification.
Infrared, ultraviolet, nuclear magnetic resonance, mass spectrometric, and gas chromatographic data have been reported for the compound, providing several independent analytical approaches for confirming its identity and monitoring its purity.
These analytical characteristics are particularly useful in quality control and process chemistry where the distinction between crotonaldehyde and structurally related aldehydes is important. 

Crotonaldehyde is not limited to synthetic manufacture and can also occur naturally in the environment and in certain foods, where it may be formed through chemical reactions involving other organic compounds.
It has been detected in emissions associated with vegetation and volcanic activity and can occur in small quantities in a variety of food products.
Its presence in these different environments reflects the fact that crotonaldehyde can be generated through several chemical and thermal processes rather than being exclusively an industrially produced substance. 

From an industrial chemistry perspective, crotonaldehyde is particularly valuable because its small molecular framework combines a reactive aldehyde group with an alkene in a single molecule.
This allows the compound to function as a versatile starting material for producing more complex organic molecules through controlled chemical transformations.
Its chemistry therefore extends beyond the properties of a simple aldehyde and places it among useful low-molecular-weight intermediates in chemical manufacturing.

The combination of volatility, conjugated reactivity, stereochemistry, and chemical instability also means that crotonaldehyde behaves differently from structurally related compounds such as butanal or propanal.
The presence of the α,β-unsaturated system increases the number of possible reaction pathways, while the tendency toward oxidation and polymerization makes control of processing conditions an important part of working with the material.
These characteristics should be considered together when evaluating crotonaldehyde for a particular chemical process rather than assessing the compound solely according to its aldehyde functionality. 

Crotonaldehyde is therefore best described as a small, volatile α,β-unsaturated aldehyde with well-defined E and Z stereoisomerism and significant synthetic reactivity.
Crotonaldehydes combination of an aldehyde group, conjugated carbon-carbon double bond, low molecular weight, and characteristic physical behavior gives it a distinctive position among industrial organic chemicals.
The established chemical identity and broad reaction potential of crotonaldehyde provide the basis for its importance as a chemical intermediate, while its specific industrial applications, hazards, and handling requirements can be considered separately. 

Another historical application involves the leather industry, where crotonaldehyde has been used in tanning-related processes.
The reactive aldehyde functionality allows it to participate in chemical interactions with organic materials, providing a basis for its use in specialized treatment processes.
Although this is a less prominent application than its role in chemical synthesis, it remains part of the documented industrial history of the substance.

Crotonaldehyde has additionally been used as a fuel-gas warning agent, taking advantage of its strong and readily recognizable odor.
The purpose of such an application is not to modify the fuel itself but to provide an odor signal that can help indicate the presence of escaping gas.
This represents a very different function from its role as a synthetic intermediate and demonstrates how its sensory properties have also contributed to its historical industrial use.

Crotonaldehyde has also been used historically as an alcohol denaturant, where its addition served to make alcohol unsuitable or undesirable for consumption.
This application relies on the chemical and sensory properties of crotonaldehyde rather than on its role as a precursor for another chemical substance.
Crotonaldehyde is therefore best regarded as a historical specialty application rather than one of the principal modern markets for crotonaldehyde.

Crotonaldehyde can also arise naturally and during thermal processes, meaning that its presence is not exclusively associated with intentional chemical manufacture.
Crotonaldehyde has been detected in certain foods and in emissions from combustion processes, including those involving fossil fuels, wood, tobacco, and heated cooking oils.
Crotonaldehyde has also been identified in some biological and environmental emissions, illustrating the range of chemical processes capable of generating this aldehyde.

Melting point: −76 °C (lit.)
Boiling point: 104 °C (lit.)
Density: 0.853 g/mL at 20 °C (lit.)
Vapor density: 2.41 (vs air)
Vapor pressure: 32 mm Hg at 20 °C
Refractive index: n20/D 1.437
Flash point: 48 °F
Storage temp.: 2-8 °C
Solubility: Water: soluble, 425.4 g/L at 20 °C
Form: Liquid
Color: Clear
Odor: Pungent
Explosive limit: 19.5%
Water solubility: 150 g/L at 20 °C
Merck: 14,2596
BRN: 906731
Henry's Law Constant: 5.4×10⁻¹ mol/(m³Pa) at 25 °C, Brockbank (2013)
Exposure limits: ACGIH TLV-TWA: 6 mg/m³ (2 ppm); OSHA PEL-TWA: 2 ppm (6 mg/m³); NIOSH REL-TWA: 2 ppm; REL-IDLH: 400 ppm
Stability: Light sensitive
Cosmetics Ingredients Functions: FRAGRANCE; PERFUMING; ANTIOXIDANT
InChIKey: MLUCVPSAIODCQM-NSCUHMNNSA-N
LogP: 0.600

Crotonaldehyde is used as a warning agent in fuel gases and gas line leaks; as solvent; in Crotonaldehyde 935 chemical warfare; as an intermediate in the manufacture of n-butanol and crotonic and sorbic acids; in resin and rubber antioxidant manufacture; also used as a solvent in mineral oil purification; as an alcohol denaturant.

Crotonaldehyde is manufactured mainly through the aldol condensation of acetaldehyde followed by dehydration, making it an important example of a commercially significant α,β-unsaturated aldehyde produced through a relatively straightforward carbon–carbon bond-forming route.
In the conventional process, acetaldehyde first undergoes aldolization to form acetaldol, which is subsequently dehydrated to produce crotonaldehyde, followed by separation and purification of the product.
Modern process research has focused on improving catalyst performance, reducing by-product formation, and making the separation stages more efficient. 

The industrial synthesis can be carried out using different catalytic systems, including basic catalysts for the initial aldolization and acidic conditions for the subsequent dehydration step.
More recent research has investigated heterogeneous catalysts such as zeolites and other solid catalytic materials as alternatives to conventional homogeneous catalytic systems.
These developments are aimed at improving selectivity toward crotonaldehyde while reducing catalyst separation problems, corrosion, and wastewater generation associated with traditional processes. 

Commercial crotonaldehyde is not necessarily a single stereoisomer but is generally composed predominantly of trans-crotonaldehyde, with the cis form present in smaller quantities.
Typical commercial material can contain more than 95% of the trans isomer, although the exact composition depends on the product grade and manufacturing specification.
This distinction is relevant when comparing commercial products because stereoisomer composition can form part of the technical specification of the material. 

Commercial grades may also contain controlled quantities of stabilizers and minor reaction-related impurities rather than consisting exclusively of pure crotonaldehyde.
BHT is used as a stabilizer in some commercial grades, while typical specifications may control acidity, water, residual acetaldehyde, butyraldehyde, butyl alcohol, aldol compounds, and higher-boiling substances.
For industrial purchasing, these parameters can therefore provide more useful information about product quality than purity alone. 

Crotonaldehyde has a strong tendency to participate in further reactions after it has been produced, which is an important consideration in both manufacturing and storage.
Depending on the conditions, it can undergo oxidation to crotonic acid, reduction to the corresponding alcohol, and polymerization or dimerization reactions that generate higher-molecular-weight products.
The susceptibility of the aldehyde to these transformations explains why commercial material is generally stabilized and why process conditions must be controlled carefully. 

Crotonaldehydes chemistry also makes crotonaldehyde a useful C4 building block, because the molecule contains four carbon atoms together with both an aldehyde function and an activated carbon–carbon double bond.
This allows chemists to use the same starting material for different synthetic pathways depending on whether the carbonyl group, the alkene, or the complete conjugated system is targeted.
The resulting chemistry provides access to a range of downstream compounds rather than limiting the material to a single transformation. 

An important downstream product is crotonic acid, which can be obtained through oxidation of crotonaldehyde.
The transformation is chemically significant because it converts the aldehyde functionality into a carboxylic acid while retaining the carbon–carbon double bond.
Crotonaldehyde can subsequently participate in further chemical manufacturing, giving crotonaldehyde a role in a wider C4 chemical value chain. 

Crotonaldehyde is also connected to the production of 2,3,6-trimethylphenol, a compound used as a starting material in the manufacture of vitamin E.
This route demonstrates that the industrial importance of crotonaldehyde is not restricted to direct production of small C4 derivatives but can extend into the synthesis of more complex aromatic intermediates.
The chemistry involves carbon–carbon bond-forming reactions that transform the relatively small aldehyde into a more highly substituted aromatic structure. 

Historically, crotonaldehyde was used on a significant scale in the manufacture of n-butanol, although this route has largely been replaced by more modern oxo-process technology.
This historical application is useful when reviewing older patents, technical literature, or chemical manufacturing records because crotonaldehyde may appear in processes that are no longer representative of current industrial production.
Its transition away from this application also illustrates how the commercial importance of a chemical intermediate can change as alternative manufacturing technologies become economically preferable. 

Crotonaldehyde has also been used in the preparation of rubber-processing chemicals, including rubber accelerators, giving the compound relevance to the synthetic rubber and elastomer industries.
In these applications, crotonaldehyde serves as a chemical starting material that is transformed into other compounds rather than being retained as the active component of the final rubber formulation.
This distinction is important when describing the material commercially because its role is primarily that of an upstream chemical intermediate. 

From a process-engineering perspective, crotonaldehyde is therefore an interesting example of a chemical whose commercial importance depends on both its intrinsic reactivity and the availability of efficient downstream conversion routes.
Crotonaldehydes manufacture, purification, stabilization, and subsequent conversion into products such as sorbic acid, crotonic acid, and other chemical intermediates form interconnected parts of the industrial value chain.
This broader context helps explain why crotonaldehyde remains an important chemical intermediate even though many of its applications involve transformation into another substance before the final product reaches the market.

Uses Of Crotonaldehyde:
Crotonaldehyde (2-butenal, β-methyl acrolein, propylene aldehyde) is similar in structure to acrolein, as both are α,β-unsaturated aldehydes. 
This structural similarity leads to similar sensitizing and irritating properties of the two compounds. 
Crotonaldehyde is used industrially in the preparation of other chemicals (chiefly sorbic acid), flavoring agents, and can form endogenously and in the environment.

Crotonaldehyde is used in the manufacture ofbutyl alcohol, butyraldehyde, and in severalorganic synthesis.
Crotonaldehyde is used primarily as an industrial chemical intermediate, where its reactive aldehyde and conjugated double bond provide a convenient starting point for the manufacture of other organic compounds.

Its most established current application is the production of sorbic acid, while other downstream products include crotonic acid, crotyl alcohol, n-butyraldehyde, and n-butanol.
This makes crotonaldehyde relevant to chemical manufacturers that use C4 aldehydes as building blocks for further synthesis. 

One of the most important applications of crotonaldehyde is the manufacture of sorbic acid, an industrial preservative used to inhibit the growth of yeasts and molds.
Crotonaldehyde provides the carbon framework required for the production of sorbic acid through subsequent chemical transformations.
Because sorbic acid is used in food preservation, this route connects crotonaldehyde with the broader food-ingredient manufacturing supply chain. 

Crotonaldehyde is also used for the production of crotonic acid, which is obtained by oxidation of the aldehyde group while retaining the carbon-carbon double bond.
Crotonic acid is itself a useful organic intermediate and can be employed in further chemical synthesis where an unsaturated carboxylic acid structure is required.
The conversion therefore provides a direct route from a reactive aldehyde to another commercially relevant C4 building block. 

Another downstream application is the manufacture of crotyl alcohol, which can be obtained by selective reduction of the aldehyde functionality of crotonaldehyde.
The resulting unsaturated alcohol is useful as a chemical intermediate in processes requiring a four-carbon molecule containing both an alkene and an alcohol group.
This transformation demonstrates how the aldehyde functionality of crotonaldehyde can be selectively modified while retaining the carbon-carbon unsaturation. 

Crotonaldehyde can also be converted into n-butyraldehyde, providing an additional route to an important C4 aldehyde used in chemical manufacturing.
Further reduction of related intermediates can lead to alcohol products such as n-butanol, although the historical importance of crotonaldehyde in n-butanol production has declined substantially.
The older route has largely been replaced by the oxo process, so it is more appropriate to describe this as a historical or secondary application rather than the principal modern use. 

Crotonaldehyde has been used in the manufacture of rubber-processing chemicals, particularly rubber accelerators used to control and improve vulcanization processes.
In this application, crotonaldehyde functions as an upstream chemical starting material that is converted into other compounds before being incorporated into rubber formulations.
Its relevance to the rubber industry therefore comes from its role in chemical synthesis rather than from direct use of crotonaldehyde in finished rubber products. 

Crotonaldehyde has also found application in leather processing and tanning, where its reactive aldehyde functionality has been utilized in chemical treatment processes.
This represents a different type of use from its role as a precursor for sorbic acid or other organic chemicals, since the compound can participate directly in the treatment of the material.
The application is documented historically and is less prominent than its current use as a chemical intermediate. 

A further historical application is the use of crotonaldehyde as an odorant or warning agent for fuel gases, taking advantage of its strong and characteristic odor.
The purpose was to help identify escaping gas and locate leaks in pipes or fuel-gas systems.
This application illustrates how the physical sensory properties of crotonaldehyde have been utilized separately from its chemical reactivity. 

Crotonaldehyde has also been used as an alcohol denaturant, where it was added to alcohol to make the resulting product unsuitable for consumption.
This application relies on the compound's chemical and sensory characteristics rather than its function as a synthetic precursor.
Crotonaldehyde is mainly of historical or specialized interest today and should not be confused with the much larger industrial market for crotonaldehyde as a chemical intermediate. 

Crotonaldehyde has been associated with the production of vitamin E intermediates, particularly through chemistry leading to 2,3,6-trimethylphenol.
This gives crotonaldehyde relevance to the broader specialty-chemical and vitamin manufacturing sectors, where relatively small C4 building blocks can be incorporated into more complex molecular structures.
The application demonstrates the ability of crotonaldehyde to contribute carbon atoms to substantially more complex downstream products. 

Crotonaldehyde has also been used as a chemical intermediate in pharmaceutical manufacturing, although this should be understood as an upstream synthesis application rather than as a pharmaceutical ingredient itself.
Its reactive α,β-unsaturated aldehyde structure allows it to participate in chemical transformations that generate more complex intermediates for subsequent manufacturing steps.
For technical purchasing purposes, the relevant requirement is therefore usually the suitability and purity of the crotonaldehyde grade for the intended synthesis. 

The agricultural chemicals industry is another area in which crotonaldehyde can function as an organic synthesis intermediate.
Its small, reactive molecular structure can be incorporated into more complex compounds during multistep chemical manufacturing.
As with pharmaceutical applications, crotonaldehyde should be regarded as a starting material or intermediate in these processes rather than as an agricultural active ingredient itself. 

Crotonaldehyde is relevant to specialty chemical manufacturing because it can be transformed through oxidation, reduction, condensation, and other reactions to produce compounds with different functional groups and physical properties.
This flexibility allows manufacturers to select a suitable conversion route depending on whether the target product requires an aldehyde, alcohol, carboxylic acid, or a more structurally complex molecule.
Its value in these processes comes from the combination of a compact C4 structure and a readily transformable conjugated aldehyde group.

In terms of the overall industrial market, crotonaldehyde is best viewed as an upstream building block rather than a finished formulation ingredient.
Crotonaldehydes principal modern importance lies in the production of sorbic acid and other chemicals, while rubber, leather, fuel-gas warning, and denaturing applications represent additional documented uses with varying degrees of current commercial relevance.
This distinction is important for industrial buyers because the appropriate grade, purity, stabilization, and packaging requirements depend on the downstream process in which the material will be consumed. 

Crotonaldehyde is used as a precursor for trimethylhydroquinone, an important intermediate in the production of vitamin E.
The synthesis uses the reactive C4 aldehyde as a starting material for building the substituted aromatic structure required for subsequent vitamin E production.
This gives crotonaldehyde a role in the specialty-chemical and nutritional-ingredient supply chain beyond its better-known application in sorbic acid manufacture. 

Crotonaldehyde can be used in the manufacture of 3-methoxybutanol, a specialty solvent obtained through reaction of crotonaldehyde with methanol followed by reduction.
3-Methoxybutanol is used in formulated products such as lacquers and varnishes, where solvent selection can influence viscosity, drying behavior, and surface finish.
Crotonaldehyde therefore provides a route from a small C4 aldehyde to a higher-value oxygenated solvent used in coating-related formulations. 

Crotonaldehyde is also involved in the synthesis of quinaldines and related heterocyclic compounds, making it useful as a carbon building block in fine-chemical production.
Its α,β-unsaturated aldehyde structure provides the reactive framework needed for cyclization and condensation reactions that construct more complex heterocyclic molecules.
Such chemistry expands its relevance from bulk intermediates into specialty organic synthesis. 

Another reported application is the preparation of thiophenes and pyridine derivatives, where crotonaldehyde contributes to the carbon skeleton of the target molecule during multistep synthesis.
These heterocyclic compounds are important structural classes within specialty chemicals and can serve as intermediates for further chemical development.
The application demonstrates the value of crotonaldehyde as a versatile C4 starting material rather than as a precursor restricted to oxygen-containing products. 

Safety Profile Of Crotonaldehyde:
Suspected carcinogen a poison by ingestion, subcutaneous, and intraperitoneal routes. 
Mutation data reported a lachrymating material that is very dangerous to the eyes. 
Human respiratory system irritant by inhalation. 

Can cause corneal burns and is irritating to the skin. 
In case of contact, immediately flush the skin or eyes with water for at least 15 minutes and get medlcal attention.
Dangerous fire hazard when exposed to heat or flame. 

To fight fire, use alcohol foam, Con, dry chemical. 
Incompatible with 1,3-butadiene and oxidizing materials. 
When heated to decomposition it emits acrid smoke and fumes.

Crotonaldehyde is a highly irritating and flammable liquid that requires controlled handling in industrial and laboratory environments.
Its vapour can irritate the eyes and respiratory tract, while direct contact can cause irritation to the skin.
Because the substance combines significant chemical reactivity with a relatively low flash point, both health and fire risks should be considered during storage and processing. 

Inhalation is an important exposure route because crotonaldehyde is volatile and can produce irritating vapours.
Exposure may cause burning or irritation of the nose and upper respiratory tract, coughing, breathing difficulty, and other respiratory symptoms depending on the concentration and duration of exposure.
Workplace ventilation should therefore be sufficient to prevent the accumulation of vapour in the breathing zone. 

Eye exposure presents a significant concern because crotonaldehyde can cause intense eye irritation and lacrimation.
Documented human exposure to relatively low concentrations has produced irritation of the eyes and upper respiratory tract, demonstrating that noticeable effects can occur well below concentrations associated with severe poisoning.
Chemical splash goggles or appropriate eye protection should therefore be worn during handling and transfer operations. 

Direct skin contact should also be avoided because crotonaldehyde can irritate the skin and prolonged or repeated contact may increase the potential for adverse effects.
Protective gloves and suitable chemical-resistant clothing are appropriate when handling the liquid, particularly during filling, sampling, cleaning, or maintenance activities.
If the material contacts the skin, the affected area should be washed promptly and contaminated clothing should be removed. 

Crotonaldehyde Procurement and Technical Support:
Ataman Kimya supports customers looking for Crotonaldehyde with dependable supply solutions and relevant technical information for industrial and formulation requirements. 
Additional support can be provided regarding product specifications, available documentation, and the evaluation of suitable product options based on the intended application.