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2-Ethylbenzaldehyde

Also known as Benzaldehyde, 2-ethyl-, 2-Ethyl benzaldehyde, o-Ethylbenzaldehyde, CS-W007787

2-Ethylbenzaldehyde is an aromatic aldehyde with the molecular formula C9H10O and molecular weight 134.17. Also known as 2-ethylbenzaldehyde, it is used as a synthesis intermediate and research chemical in applications involving aromatic aldehyde reactivity.

Aromatic Aldehydes Ethyl-Substituted Benzaldehydes
C₉H₁₀O
C₉H₁₀O

Product identity

CAS number
22927-13-5
Molecular formula
C9H10O
Molecular weight
134.17 g/mol
Category
Aromatic Aldehydes
Subcategory
Ethyl-Substituted Benzaldehydes
Common aliases
Benzaldehyde, 2-ethyl-, 2-Ethyl benzaldehyde, o-Ethylbenzaldehyde

Product overview

What is 2-Ethylbenzaldehyde?

2-Ethylbenzaldehyde, also known as o-ethylbenzaldehyde, is an aromatic aldehyde containing a benzene ring bearing adjacent ethyl and formyl substituents. Its IUPAC name is 2-ethylbenzaldehyde, and its molecular formula is C9H10O. The stated molecular weight is 134.17. The compound is identified by CAS number 22927-13-5 and is also listed under Benzaldehyde, 2-ethyl-, and 2-Ethyl benzaldehyde.

As an aromatic aldehyde, 2-ethylbenzaldehyde contains a reactive carbonyl group directly attached to an aromatic ring, while the neighbouring ethyl substituent influences its steric environment and electronic character. Aldehydes can participate in oxidation, condensation, and carbon-carbon bond-forming chemistry under suitable conditions. Actual appearance, odour, stability, and reactivity should be assessed from the specific material and process conditions.

Its established chemical context is as an intermediate or building block used by professional laboratories and manufacturers developing substituted aromatic molecules. Potential work may include exploratory synthesis, reference preparation, reaction studies, and route development. A common use category does not establish suitability for every formulation, analytical method, or downstream product; compatibility and reaction performance require application-specific assessment.

Selection should consider the intended transformation, aldehyde reactivity, neighbouring ethyl substitution, solvent system, catalysts, temperature, and sensitivity to air, moisture, or incompatible reagents. Users should review the applicable product documentation and conduct their own technical evaluation before scale-up. Storage, transfer, exposure controls, waste handling, and transport decisions should follow current regional requirements and the responsible organisation’s procedures. For commercial selection, the compound name should be considered separately from the specification and supplied form required for the intended process. Technical teams can use that distinction to compare documentation and application requirements without assuming that every listed material is interchangeable.

Technical profile

Product properties

Review the product identity and general physical profile before specifying the grade required for your operation.

Category
Aromatic Aldehydes
Subcategory
Ethyl-Substituted Benzaldehydes
IUPAC name
2-ethylbenzaldehyde
Molecular formula
C9H10O
Molecular weight
134.17 g/mol

Uses and markets

Applications and industries

The correct product specification depends on the intended process, grade requirements and operating conditions.

Detailed product information

Detailed 2-Ethylbenzaldehyde product information

Chemical identity and aromatic aldehyde structure

2-Ethylbenzaldehyde is a substituted benzaldehyde in which an ethyl group occupies the position adjacent to the aldehyde-bearing carbon. This arrangement combines the characteristic reactivity of an aromatic aldehyde with the steric and hydrophobic contribution of an ortho ethyl substituent. The compound is listed as CAS 22927-13-5, with formula C9H10O and stated molecular weight 134.17.

The aldehyde group provides a useful functional handle for synthetic chemistry. Depending on the reaction design, it can undergo transformations such as oxidation to a carboxylic acid, reduction to an alcohol, condensation with suitable nucleophiles, or carbon-carbon bond-forming reactions. Reaction choice, selectivity, and conversion depend on catalysts, solvents, temperature, concentration, and the condition of the individual material.

Reactivity considerations in synthesis

For 2-Ethylbenzaldehyde, the ortho relationship between the ethyl and formyl groups can affect approach to the carbonyl and may influence selectivity in reactions involving the aldehyde function. Such effects are context-dependent rather than fixed performance specifications. Chemists should assess reaction behaviour using controlled experiments and suitable analytical monitoring, particularly when transferring a literature transformation to a new substrate, solvent, catalyst, or scale.

Potential degradation pathways for aldehydes can include oxidation or other reactions promoted by incompatible chemicals and unsuitable environmental conditions. Practical handling should therefore minimise unnecessary exposure to heat, air, moisture, and reactive contaminants where relevant. The responsible laboratory or plant should define controls using current hazard information, process knowledge, engineering measures, and applicable local requirements.

Professional applications and development work

In research and development, 2-ethylbenzaldehyde may serve as a starting material, intermediate, or substrate during the preparation of more complex aromatic compounds. It can support analogue synthesis, reaction discovery, and comparative studies involving substituted benzaldehydes. A use designation indicates a recognised area of chemical work, not a guarantee that every grade or batch will meet the needs of a particular route.

Analytical laboratories may consider the compound for method development, identity comparisons, or quality-control investigations when a suitable reference approach is established. Any use in a quantitative method should be supported by appropriate standards, calibration strategy, selectivity assessment, and measurement controls. Researchers should also distinguish between material used for exploratory chemistry and material selected for a defined regulated or commercial process.

Selection, handling, and process evaluation

For 2-Ethylbenzaldehyde, before selecting this compound for a process, review the target reaction, expected impurities, downstream purification, material compatibility, and analytical requirements. Aldehyde-containing intermediates can behave differently across reaction families, so small-scale testing may help establish conversion and selectivity before process development. The presence of the adjacent ethyl group should be considered when comparing this substrate with unsubstituted or differently substituted benzaldehydes.

Handling and storage decisions should be based on the current safety documentation, site risk assessment, and relevant jurisdictional rules. Use suitable containment, ventilation, protective equipment, and waste procedures for the operation, while preventing contact with incompatible reagents. Transport, labelling, and disposal classifications may vary by region and use conditions; responsible users must make those determinations for their own operations.

Frequently asked questions

Questions about 2-Ethylbenzaldehyde

Why does material specification matter when evaluating 2-Ethylbenzaldehyde?

Chemical identity confirms that the material is 2-Ethylbenzaldehyde, but it does not by itself define purity, physical form, concentration, test methods or suitability for a particular process. Those details belong to the current supplier specification and related documentation. Technical and purchasing teams should compare that information with the intended formulation, operating conditions and internal approval criteria before use. If the supplier, grade, process or end-use requirement changes, the earlier assessment may no longer apply. Keeping identity and specification separate helps prevent similarly named or differently supplied materials from being treated as automatically interchangeable. It also creates a clearer record for receiving, quality review and later change control.

Which reactions can involve 2-Ethylbenzaldehyde?

The aldehyde group can participate in several established reaction classes when suitable reagents and conditions are selected. Examples include oxidation to the corresponding aromatic carboxylic acid, reduction to a benzyl alcohol derivative, condensation with amines to form imines, and carbon-carbon bond-forming reactions with appropriate nucleophiles. It may also take part in other transformations developed for aromatic aldehydes. These possibilities describe chemical reactivity, not guaranteed conversion or selectivity. The neighbouring ethyl substituent, catalyst, solvent, temperature, concentration, and work-up can all affect the outcome. Small-scale experimentation and analytical monitoring are appropriate before process adoption or scale-up.

How can the ortho ethyl group affect its chemical behaviour?

An ethyl group positioned adjacent to the aldehyde can influence the steric environment around the carbonyl and alter the overall electronic character of the aromatic ring. Steric effects may affect how readily certain reagents approach the aldehyde, while electronic effects can influence reaction rates or intermediate stability. The significance varies substantially with the transformation, catalyst, solvent, temperature, and concentration. It is therefore inappropriate to assume that every reaction will differ in the same way from benzaldehyde or another positional isomer. Comparative experiments, supported by suitable analytical methods, can establish the behaviour relevant to a particular synthetic route.

What factors should be considered when using it in a synthesis?

Important considerations include the desired transformation, reagent compatibility, solvent choice, catalyst loading, temperature control, reaction time, mixing, and the planned isolation method. Aldehydes may be susceptible to oxidation or unintended reactions with strong nucleophiles, oxidants, reductants, or other incompatible materials. The adjacent ethyl substituent may also affect selectivity and purification relative to related substrates. Process developers should begin with a controlled experiment, monitor starting material and products using an appropriate analytical method, and assess impurity formation. Scale-up should follow a documented technical and safety review rather than relying solely on small-scale observations.

Can 2-Ethylbenzaldehyde be used for analytical work?

It may be suitable for selected analytical or quality-control purposes when the intended method requires this specific compound or a related reference material. Possible activities include identity comparison, method development, reaction monitoring, and investigation of process samples. Suitability depends on the analytical objective, method selectivity, concentration range, matrix, purity needs, stability, and traceability requirements. A laboratory should establish an appropriate calibration or comparison approach and verify that the material behaves as expected under the method conditions. Exploratory use should not automatically be treated as evidence that the compound is suitable for a regulated assay or release method.

What handling principles apply to this aromatic aldehyde?

Handling should be guided by the current safety documentation, workplace risk assessment, process scale, and applicable regional requirements. Operations should use appropriate containment and ventilation, prevent unnecessary contact or inhalation, and keep the material away from incompatible reagents identified by the responsible technical or safety team. Exposure controls and protective equipment should reflect the actual task, concentration, and equipment used. Containers and residues should be managed through established site procedures, and waste should be classified and disposed of according to local rules. Storage conditions should protect material integrity while also addressing fire, chemical compatibility, access, and environmental controls.

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