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2-Ethylphenol

Also known as o-Ethylphenol, Phlorol, Phenol, o-ethyl-, Phenol, 2-ethyl-

2-Ethylphenol is an ethyl-substituted phenol with the molecular formula C8H10O and molecular weight 122.16. Miilex Chemicals provides technical product information for researchers, formulators and industrial chemical buyers evaluating this aromatic hydroxyl compound.

Aromatic Chemicals Alkylphenols
C₈H₁₀O
C₈H₁₀O

Product identity

CAS number
90-00-6
Molecular formula
C8H10O
Molecular weight
122.16 g/mol
Category
Aromatic Chemicals
Subcategory
Alkylphenols
Common aliases
o-Ethylphenol, Phlorol, Phenol, o-ethyl-

Product overview

What is 2-Ethylphenol?

2-Ethylphenol is an aromatic organic compound in the alkylphenol family. Its systematic name is 2-ethylphenol, and it is also known as o-ethylphenol, phlorol, phenol, o-ethyl-, phenol, 2-ethyl-, and 1-ethyl-2-hydroxybenzene. The compound has CAS number 90-00-6, molecular formula C8H10O, and molecular weight 122.16. Its structure combines a phenolic hydroxyl group with an ethyl substituent on a benzene ring.

As a substituted phenol, 2-ethylphenol contains a polar hydroxyl function alongside a non-polar aromatic and ethyl portion. This combination influences intermolecular interactions, acidity relative to ordinary alcohols, and compatibility with different organic environments. Physical behaviour can vary with temperature, purity, and handling conditions, so users should consult current technical and safety documentation for measured properties relevant to their operation.

2-Ethylphenol is encountered primarily as a chemical intermediate, reference material, or research substance in aromatic chemistry. Its functional groups make it relevant to studies of substitution, oxidation, derivatisation, and formulation behaviour. Potential use in synthesis or analytical work does not by itself establish suitability for a particular process, product category, or regulated application; that determination requires technical evaluation by the responsible user.

Selection should begin with identity confirmation, intended reaction or analytical purpose, and compatibility with the surrounding process. Users may also consider impurity profile, water content, colour, storage conditions, and the effect of phenolic functionality on materials or reagents. Because requirements differ across laboratories and manufacturing systems, a particular commercial grade should be assessed against the receiving specification before technical adoption. For commercial selection, the compound name should be considered separately from the specification and supplied form required for the intended process.

Technical profile

Product properties

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

Category
Aromatic Chemicals
Subcategory
Alkylphenols
IUPAC name
2-ethylphenol
Molecular formula
C8H10O
Molecular weight
122.16 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-Ethylphenol product information

Chemical identity and structural context

2-Ethylphenol belongs to the alkylphenol class of aromatic compounds. The hydroxyl group is attached directly to a benzene ring, while an ethyl group occupies the adjacent, or ortho, position. This arrangement gives the molecule a defined balance between phenolic polarity and hydrocarbon character, making it a useful subject for aromatic chemistry, analytical characterization and controlled chemical-development work.

The supplied identity is CAS 90-00-6, IUPAC name 2-ethylphenol, formula C8H10O and molecular weight 122.16. Synonyms can appear in technical records, analytical methods and purchasing documentation, so matching the CAS number and molecular formula is important when distinguishing this substance from other cresols, ethylphenol isomers or unrelated aromatic materials.

Reactivity and formulation considerations

For 2-Ethylphenol, the phenolic hydroxyl group can participate in acid-base behaviour, hydrogen bonding and derivatisation reactions, while the aromatic ring supports electrophilic substitution under suitable conditions. The neighbouring ethyl substituent may influence steric access and electronic behaviour compared with unsubstituted phenol. Actual reaction outcomes depend on reagents, catalysts, solvent, temperature, concentration and process design rather than identity alone.

In formulation or materials research, the relationship between polarity and hydrophobic character may affect dissolution, partitioning and compatibility with other organic components. These effects should be measured in the intended system. Users should avoid assuming that observations from one solvent, temperature range or purity level transfer directly to another process without suitable laboratory assessment and documented controls.

Analytical and research use

2-Ethylphenol may be relevant to laboratories studying aromatic compounds, phenolic functionality or reaction pathways. Infrared, nuclear magnetic resonance, chromatography and mass-spectrometric approaches can each provide complementary information, although method selection and interpretation remain the responsibility of the analytical team. Reference solutions, calibration practices and sample preparation should be designed around the purpose and performance requirements of the method.

Research groups may also investigate oxidation, coupling, substitution or transformation of the molecule as part of broader organic and materials programmes. Such work can help establish reaction behaviour, impurity formation and compatibility. Results should be treated as system-specific, particularly where trace contaminants, oxygen exposure, light, moisture or reactive co-components could affect the observed outcome.

Specification and handling selection

For 2-Ethylphenol, choosing a suitable supply begins with confirming nomenclature, CAS number, formula and the intended technical function. The receiving organisation may then define its own requirements for appearance, assay, moisture, residual solvents, trace impurities, container compatibility and analytical documentation. These parameters should be agreed before use because the needs of a synthesis laboratory may differ from those of a process-development facility.

Phenolic compounds should be managed through the user’s established chemical-handling programme, including appropriate ventilation, protective measures, segregation and waste controls based on the current safety documentation. Storage conditions should be selected to limit unwanted exposure to heat, ignition sources, incompatible reagents and contamination. Local legal requirements and site procedures remain applicable in every country.

Frequently asked questions

Questions about 2-Ethylphenol

How does the ortho ethyl group influence 2-Ethylphenol compared with phenol?

The ethyl group changes both the electronic environment and the physical character of the phenolic ring. It adds hydrocarbon bulk, increases the molecule’s non-polar surface, and can influence how the hydroxyl group interacts with nearby molecules. Because the substituent is adjacent to the hydroxyl group, steric effects may also affect access to the ring and the behaviour of derivatives formed during synthesis. These differences can influence solubility, chromatographic retention, reaction selectivity and formulation compatibility. However, the size of each effect depends on solvent, temperature, concentration, reagents and measurement method. Direct comparison under controlled conditions is preferable to relying on general structural assumptions.

What types of reactions can involve 2-Ethylphenol?

The phenolic hydroxyl group can participate in acid-base reactions, etherification, esterification and other derivatisation strategies when suitable reagents and conditions are selected. The aromatic ring may also undergo substitution or oxidation chemistry, depending on the reaction system. The neighbouring ethyl group can affect both electronic response and steric accessibility, so reaction rates and product distributions should be established experimentally. Oxidative conditions require particular attention because phenolic substrates may form complex mixtures or coloured products. A reaction plan should consider solvent, catalyst, atmosphere, temperature, water content, work-up and analytical monitoring. No single transformation should be assumed suitable without route-specific evaluation.

Why might 2-Ethylphenol be useful in analytical or research laboratories?

Its defined molecular structure and phenolic functionality make 2-Ethylphenol relevant to studies of substituted aromatic compounds. Laboratories may examine it using chromatography, infrared spectroscopy, nuclear magnetic resonance, mass spectrometry or other techniques, depending on the analytical question. It can support investigations of identity, purity, reaction conversion, degradation or derivatisation behaviour. The compound may also serve as a model substrate in research on phenolic chemistry, provided the experimental design is appropriate. Analytical usefulness depends on the method, concentration range, matrix, reference approach and instrument configuration. Analysts should establish selectivity, preparation procedures and quality controls for their particular application.

What factors can affect the solubility or compatibility of 2-Ethylphenol?

Solubility and compatibility are influenced by the balance between the phenolic hydroxyl group and the aromatic ethyl-substituted ring. Solvent polarity, hydrogen-bonding capacity, temperature, concentration and the presence of salts or other dissolved materials can all affect behaviour. The compound may interact differently with aqueous, polar organic and non-polar organic environments. In mixtures, co-solvents, surfactants, polymers and reactive ingredients may alter apparent solubility or stability. Compatibility should therefore be tested in the actual formulation or process medium, using controlled conditions and suitable observation or analytical measurements. Small-scale screening is prudent before a material is introduced into a larger operation.

What should laboratories consider when storing and handling 2-Ethylphenol?

Handling should follow the current supplier safety documentation and the laboratory’s chemical-management procedures. Users should plan suitable ventilation, protective equipment, clean transfer practices, spill response and waste segregation before opening a container. Storage decisions should account for temperature control, contamination prevention, container compatibility and separation from materials that could react with phenolic compounds or organic chemicals. Labels and secondary containment can help maintain identity and reduce accidental mixing. Because requirements vary by jurisdiction, facility and quantity, local occupational, environmental and fire-safety rules should be applied. Personnel should be trained to recognise the material and respond according to the site’s established procedures.

How should a user distinguish 2-Ethylphenol from other ethylphenol or cresol isomers?

Isomer distinction requires more than a similar common name. Users should compare the CAS number, systematic name, molecular formula and structural position of substituents, then confirm identity with suitable analytical evidence where necessary. 2-Ethylphenol has the ethyl group adjacent to the hydroxyl group on the benzene ring, whereas positional isomers place substituents differently. Cresols contain a methyl rather than an ethyl substituent and therefore have a different formula and molecular weight. Chromatographic retention, spectroscopic signals and reference comparisons can help resolve closely related materials. Careful nomenclature review is especially important when selecting standards, planning synthesis or interpreting supplier documentation.

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