2,4-Di-tert-amylphenol: Handling, Uses & Lab Protocol Guide

2,4-Di-tert-amylphenol is a sterically hindered phenolic compound widely employed in research and industrial applications as an antioxidant stabilizer, process chemical, and reference reagent for studying phenol-mediated radical scavenging mechanisms.

CAS Number

120-95-6

Molecular Formula

C16H26O

Molecular Weight

238.37 g/mol

Appearance

White to off-white crystalline solid or viscous liquid depending on temperature

Recommended Storage

Store at room temperature (15–25 °C), away from light, heat, and moisture, in a tightly sealed container

SKU

D155373

Chemical Identity and Properties

2,4-Di-tert-amylphenol (CAS 120-95-6), also known as 2,4-bis(1,1-dimethylpropyl)phenol, is a disubstituted phenol bearing two bulky tert-amyl (1,1-dimethylpropyl) groups at the 2- and 4-positions of the aromatic ring. This steric environment around the hydroxyl group confers significant resistance to oxidative degradation and distinguishes it from less-hindered phenols.

Key physicochemical characteristics include a molecular formula of C₁₆H₂₆O, molecular weight of 238.37 g/mol, and moderate lipophilicity consistent with a high log P value typical of dialkylphenols. The compound is practically insoluble in water but freely soluble in common organic solvents such as ethanol, acetone, dichloromethane, toluene, and diethyl ether. Its melting point and exact physical state at ambient temperature should be verified against the certificate of analysis supplied with each lot (see review flags).

The phenolic –OH group retains reactivity toward electrophiles, oxidants, and coupling partners despite steric shielding, making 2,4-Di-tert-amylphenol a valuable model substrate in mechanistic studies of hindered-phenol antioxidant chemistry.

Safety and Handling Precautions

Before working with 2,4-Di-tert-amylphenol, consult the current Safety Data Sheet (SDS) for the specific lot. General precautions for substituted alkylphenols apply:

• Personal Protective Equipment (PPE): Wear chemical-resistant gloves (nitrile recommended), laboratory coat, and safety goggles. Use a face shield when handling bulk quantities.
• Ventilation: Conduct all weighing and dissolution steps in a well-ventilated fume hood to avoid inhalation of dust or vapors.
• Skin and Eye Contact: Phenolic compounds can cause irritation or corrosion on prolonged contact. In case of skin contact, wash immediately with soap and water for at least 15 minutes. For eye contact, irrigate with copious water and seek medical attention.
• Ingestion/Inhalation: Avoid generating aerosols. Do not eat, drink, or smoke in the laboratory during use.
• Waste Disposal: Dispose of phenolic waste in accordance with local regulations; do not pour down the drain without prior treatment or authorization.

Store the compound in a tightly sealed amber glass or HDPE container at 15–25 °C, away from oxidizing agents, strong bases, and ignition sources. Shelf stability under recommended conditions is typically satisfactory for extended periods, but verify with the lot-specific certificate of analysis.

Solution Preparation and Solubility Protocol

The following general protocol covers preparation of stock and working solutions of 2,4-Di-tert-amylphenol for research use.

Materials Required

• 2,4-Di-tert-amylphenol (Aladdin D155373)
• Analytical balance (0.1 mg readability)
• Appropriate organic solvent (ethanol, DMSO, acetone, DCM, or toluene)
• Volumetric flask or calibrated glass vial
• Fume hood, PPE as described above

Stock Solution Preparation

1. Allow the sealed container to equilibrate to room temperature before opening to prevent moisture condensation on the solid.
2. Tare a clean, dry glass vial on the analytical balance. Weigh the required mass of 2,4-Di-tert-amylphenol directly into the vial.
3. Add approximately 80% of the target volume of chosen solvent and mix by gentle vortexing or magnetic stirring until fully dissolved. The compound dissolves readily in ethanol, DMSO, and chlorinated solvents at concentrations up to at least 10 mg/mL; higher concentrations should be validated empirically.
4. Bring to final volume with additional solvent. Mix thoroughly.
5. For long-term storage of stock solutions, transfer to amber vials, seal under nitrogen or argon if oxidation-sensitive applications are intended, and store at –20 °C or as appropriate for the solvent system.

Working Solution Dilution

Dilute stock solutions into the aqueous or organic assay medium immediately before use. If aqueous dilution is required, maintain the organic co-solvent below 1% (v/v) to minimize interference with biological assays, or as dictated by the specific assay conditions.

Verify concentration by UV-Vis absorbance or HPLC as appropriate for the precision required by the experiment. Record lot number and preparation date on all solution labels.

Research Applications

2,4-Di-tert-amylphenol finds utility across several research domains due to its structural features as a sterically hindered phenol:

• Antioxidant Mechanism Studies: The compound serves as a model hindered phenol for investigating hydrogen-atom transfer (HAT) and proton-coupled electron transfer (PCET) mechanisms underlying radical chain inhibition in lipid oxidation and polymer degradation research.
• Analytical Chemistry Reference Standard: Used as a reference or calibration standard in chromatographic methods (GC, HPLC) for the detection and quantification of phenolic antioxidants in food contact materials, polymers, and environmental matrices.
• Synthesis Intermediate: The activated aromatic ring and phenolic –OH group make 2,4-Di-tert-amylphenol a substrate for electrophilic aromatic substitution, etherification, esterification, and Mannich-type reactions in the synthesis of more complex phenolic derivatives.
• Material Science: Studied as a representative industrial antioxidant to evaluate stabilization efficiency in polymer and lubricant formulation research.
• Environmental Research: Investigated as an environmental contaminant marker, as alkylphenols can enter aquatic ecosystems from industrial effluents; used in ecotoxicology assay development and analytical method validation.

Researchers should verify suitability for specific biological assays, as phenolic compounds may interfere with common colorimetric and fluorometric detection systems.

Quality Control and Documentation

Rigorous documentation and quality checks are essential when using 2,4-Di-tert-amylphenol in regulated or publication-grade research:

• Certificate of Analysis (CoA): Obtain and retain the lot-specific CoA from Aladdin Scientific (SKU D155373). Verify purity (typically reported by GC or HPLC), melting point, and structural identity (NMR or IR confirmation) meet your experimental requirements before use.
• Lot-to-Lot Consistency: For multi-batch studies, cross-reference CoA data across lots and consider running an internal reference standard to normalize results.
• Stability Monitoring: Periodically re-analyze stock solutions by HPLC or GC if stored over extended periods. Discard solutions showing discoloration or precipitation.
• Instrument Calibration: Ensure analytical balances, pipettes, and spectrophotometers used in preparation and analysis are within calibration.
• Record Keeping: Document batch numbers, supplier, storage conditions, preparation dates, concentrations, and any deviations from the protocol in a laboratory notebook or LIMS.

Following Good Laboratory Practice (GLP) documentation principles ensures reproducibility and traceability of results obtained using this compound.

Frequently asked questions

What solvents are recommended for dissolving 2,4-Di-tert-amylphenol?

2,4-Di-tert-amylphenol is practically insoluble in water but dissolves readily in organic solvents including ethanol, DMSO, acetone, dichloromethane, toluene, and diethyl ether. For biological assays requiring aqueous media, prepare a concentrated stock in DMSO or ethanol and dilute to keep the organic co-solvent below 1% (v/v) in the final assay volume.

How should 2,4-Di-tert-amylphenol be stored to maximize shelf life?

Store 2,4-Di-tert-amylphenol in a tightly sealed amber glass or HDPE container at room temperature (15–25 °C), away from direct light, heat, moisture, and oxidizing agents. Stock solutions in organic solvents should be stored at –20 °C under inert gas (nitrogen or argon) and protected from light. Always consult the lot-specific Certificate of Analysis for confirmed stability data.

Can 2,4-Di-tert-amylphenol interfere with common biochemical assays?

Yes, phenolic compounds including 2,4-Di-tert-amylphenol can interfere with colorimetric assays (e.g., Folin-Ciocalteu, Bradford, BCA protein assays) and certain fluorometric assays due to their intrinsic UV absorbance and reducing properties. Researchers should run appropriate vehicle controls and, where possible, select detection methods that are orthogonal to phenolic interference, such as HPLC-based quantification.

What is the purity specification for Aladdin D155373?

The purity specification for Aladdin Scientific SKU D155373 (2,4-Di-tert-amylphenol) is provided in the lot-specific Certificate of Analysis available from Aladdin Scientific. Please contact Aladdin customer service or download the CoA from the product page to obtain the confirmed purity value for your lot.

Is 2,4-Di-tert-amylphenol classified as an endocrine-disrupting chemical?

Certain alkylphenols are under scrutiny as potential endocrine disruptors; however, the specific classification of 2,4-Di-tert-amylphenol depends on current regulatory frameworks in your jurisdiction. Researchers should consult current regulatory databases (e.g., EU SVHC lists, EPA CompTox) and the compound SDS for the latest classification status, and handle it with appropriate precautions as a potentially bioactive phenolic compound.

References

1. Aladdin Scientific. Product Information and Certificate of Analysis: 2,4-Di-tert-amylphenol, SKU D155373. Aladdin Scientific, Shanghai.
2. Ingold, K.U.; Pratt, D.A. Advances in radical-trapping antioxidant chemistry in the 21st century: a kinetics and mechanisms perspective. Chemical Reviews, 2014, 114(18), 9022–9046. doi:10.1021/cr500226n
3. Operator Safety Data Sheet for Alkylphenols — general class reference. Consult current SDS from supplier for lot-specific hazard data.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.