3-(4-Ethylphenyl)-2,2-dimethylpropanal: Properties & Applications

3-(4-Ethylphenyl)-2,2-dimethylpropanal is a branched-chain aromatic aldehyde valued in fragrance chemistry and organic synthesis research for its distinctive structural features combining a para-ethylphenyl aromatic ring with a sterically hindered gem-dimethyl-substituted aldehyde carbon.

Chemical Name

3-(4-Ethylphenyl)-2,2-dimethylpropanal

Functional Group

Aldehyde (–CHO) with gem-dimethyl substitution at the alpha carbon

Core Structure

Para-ethylphenyl aromatic ring linked via a methylene to a 2,2-dimethylpropanal moiety

Aladdin SKU

D695465

Compound Class

Branched aromatic aldehyde; fine chemical / specialty reagent

Steric Character

gem-Dimethyl group at alpha position confers resistance to common aldehyde reactions such as aldol condensation

Chemical Identity and Structural Features

3-(4-Ethylphenyl)-2,2-dimethylpropanal belongs to the class of branched aromatic aldehydes. Its molecular architecture consists of three principal elements: a para-substituted ethylbenzene ring, a methylene (–CH₂–) linker, and a 2,2-dimethylpropanal terminus. The aldehyde carbonyl (–CHO) is the primary reactive site, while the two methyl groups at the adjacent alpha carbon introduce significant steric hindrance. This gem-dimethyl motif is a well-established strategy in medicinal and fragrance chemistry to modulate metabolic stability and control reactivity at the carbonyl centre.

The para-ethyl substituent on the phenyl ring enhances lipophilicity relative to unsubstituted or methyl-substituted analogues, influencing both solubility behaviour in organic solvents and potential interactions in receptor-binding or olfactory contexts. The compound is catalogued under Aladdin Scientific SKU D695465 and is supplied as a research-grade fine chemical.

Reactivity and Handling Considerations

As an aldehyde, 3-(4-Ethylphenyl)-2,2-dimethylpropanal is susceptible to oxidation to the corresponding carboxylic acid under ambient conditions, and researchers should store the compound under inert atmosphere (nitrogen or argon) at cool temperatures to minimise autoxidation. The gem-dimethyl substitution at the alpha position significantly impedes enolisation and self-condensation (aldol reactions), making this compound more stable than its unhindered linear counterparts and simplifying handling in multi-step synthesis workflows.

The aldehyde functionality remains available for standard transformations including nucleophilic addition (Grignard reagents, hydrides), reductive amination, Wittig or Horner–Wadsworth–Emmons olefination, and condensation with active methylene compounds. Researchers should consult the applicable Safety Data Sheet (SDS) before use; standard laboratory precautions for aldehydes — including avoidance of ignition sources and use of appropriate ventilation — apply.

Applications in Fragrance and Organic Synthesis Research

Branched aromatic aldehydes of this structural type are well represented in the fragrance and flavour industry, where steric bulk at the alpha carbon is frequently exploited to achieve greater chemical stability under formulation conditions while preserving desirable olfactory profiles. The para-ethylphenyl moiety contributes a warm, woody-floral character typical of this aldehyde class, although the specific odour profile of 3-(4-Ethylphenyl)-2,2-dimethylpropanal should be verified by qualified evaluators under controlled conditions.

In organic synthesis, this compound serves as a versatile electrophilic building block. The combination of an electron-rich aromatic ring and a reactive but sterically protected aldehyde allows selective functionalisation strategies that are difficult to achieve with simpler reagents. It may find use in the preparation of pharmaceutical intermediates, agrochemical scaffolds, or advanced material precursors, particularly where a defined degree of lipophilicity and steric control are required.

Ordering and Specifications

3-(4-Ethylphenyl)-2,2-dimethylpropanal is available from Aladdin Scientific under SKU D695465. Researchers and procurement teams are encouraged to contact Aladdin Scientific directly or visit the product page for current pricing, available pack sizes, purity specifications, and certificate of analysis (CoA) documentation. All reagents are subject to Aladdin's standard quality control processes to ensure batch-to-batch consistency for research applications.

For bulk quantities or custom purity requirements, please reach out to the Aladdin Scientific sales team. Export compliance and shipping conditions should be confirmed at the time of ordering, particularly for international shipments.

Frequently asked questions

What makes 3-(4-Ethylphenyl)-2,2-dimethylpropanal more stable than simple aromatic aldehydes?

The gem-dimethyl substitution at the alpha carbon introduces steric hindrance that inhibits enolisation and aldol self-condensation, which are common degradation pathways for aldehydes without alpha-branching. This makes the compound easier to handle and store in multi-step synthetic workflows.

What chemical transformations can be performed on 3-(4-Ethylphenyl)-2,2-dimethylpropanal?

The aldehyde group can undergo nucleophilic addition with Grignard reagents or hydride reducing agents, reductive amination to yield amines, Wittig-type olefination to give alkenes, and condensation reactions with active methylene compounds. The aromatic ring also offers opportunities for electrophilic aromatic substitution, depending on reaction conditions.

How should 3-(4-Ethylphenyl)-2,2-dimethylpropanal be stored to maintain product integrity?

Like most aldehydes, this compound should be stored in a tightly sealed container under an inert atmosphere (nitrogen or argon) at cool temperatures, away from oxidising agents and ignition sources. Refer to the Aladdin Scientific Certificate of Analysis and Safety Data Sheet for specific storage temperature recommendations and shelf-life information.

Is 3-(4-Ethylphenyl)-2,2-dimethylpropanal available for bulk or custom orders?

Yes, Aladdin Scientific supports bulk quantity inquiries and custom purity specifications for this compound (SKU D695465). Contact the Aladdin Scientific sales team directly to discuss requirements, lead times, and pricing for non-standard pack sizes.

References

1. March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 4th ed. Wiley-Interscience, 1992. (General aldehyde reactivity and gem-dimethyl steric effects.)
2. Bauer, K.; Garbe, D.; Surburg, H. Common Fragrance and Flavor Materials, 4th ed. Wiley-VCH, 2001. (Structural classes of aromatic aldehydes in fragrance applications.)
3. Aladdin Scientific product page for 3-(4-Ethylphenyl)-2,2-dimethylpropanal, SKU D695465.

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