Chemical Identity and Physical Properties

1-(4-Ethylphenyl)thiourea belongs to the monosubstituted arylthiourea class, characterized by a thiourea core (–NH–C(=S)–NH₂) attached to a 4-ethylphenyl group. The para-ethyl substituent on the aromatic ring modulates the electron density of the nitrogen atom adjacent to the aryl group, influencing both the compound's acidity (N–H pKa) and its reactivity in downstream transformations compared with unsubstituted phenylthiourea.

Arylthioureas of this type are typically crystalline solids with moderate polarity. They are generally soluble in polar aprotic solvents such as DMSO and DMF, sparingly soluble in ethanol and acetonitrile, and poorly soluble in non-polar solvents such as hexane. Exact melting point, solubility data, and purity specifications for SKU E1071772 should be confirmed from the Aladdin Scientific product datasheet prior to use.

Synthesis and Preparation Methods

Monosubstituted arylthioureas such as 1-(4-Ethylphenyl)thiourea are classically prepared by reacting the corresponding primary amine — in this case 4-ethylaniline — with ammonium thiocyanate or directly with thiophosgene equivalents under mild aqueous or alcoholic conditions. The reaction of aryl amines with ammonium thiocyanate typically proceeds via initial salt formation followed by thermal rearrangement to give the N-arylthiourea product in good yield.

Alternatively, the direct addition of 4-ethylaniline to carbamoylsulfenyl chlorides or isothiocyanates provides access to the same scaffold. These routes are well-documented in the synthetic literature for analogous arylthioureas. Researchers should verify specific reaction conditions, yields, and purification procedures from peer-reviewed synthetic references before establishing a laboratory protocol.

Biological Activity and Research Applications

Arylthiourea derivatives represent a pharmacologically significant class of compounds. The thiourea motif has been associated with diverse biological activities in the literature, including antimicrobial, antifungal, antitumor, and enzyme-inhibitory properties. The presence of a para-alkyl substituent such as the ethyl group in 1-(4-Ethylphenyl)thiourea can modulate lipophilicity and membrane permeability relative to the parent phenylthiourea, potentially affecting bioavailability and target engagement in biological assays.

Beyond direct bioactivity, arylthioureas are important synthetic intermediates. They serve as precursors to benzimidazolethiones, thiadiazoles, and other heterocyclic scaffolds of medicinal interest through condensation reactions. In organocatalysis, N-arylthioureas function as bifunctional hydrogen-bond-donor catalysts, activating electrophilic substrates through double N–H hydrogen bonding in asymmetric synthesis.

In agrochemical research, thiourea derivatives have been explored as pesticidal agents and enzyme inhibitors. Researchers using 1-(4-Ethylphenyl)thiourea should consult primary literature for specific biological data relevant to their target, as activity data specific to this compound were not provided in the available source material.

Handling, Storage, and Safety Guidelines

As with all laboratory reagents, 1-(4-Ethylphenyl)thiourea should be handled in accordance with standard chemical hygiene practices. Use appropriate personal protective equipment (PPE) including nitrile gloves, safety goggles, and a laboratory coat. Handling should be performed in a well-ventilated area or fume hood to minimize inhalation of dust or aerosols.

Thiourea derivatives as a class may exhibit irritant properties toward skin, eyes, and the respiratory tract. Researchers should consult the Safety Data Sheet (SDS) for SKU E1071772, available from Aladdin Scientific, for confirmed hazard classifications, GHS pictograms, first-aid measures, and disposal requirements before initiating work with this compound.

For storage, arylthioureas are generally recommended to be kept in tightly sealed containers, away from moisture and direct light, at controlled room temperature or as specified on the product label. Confirm exact storage conditions from the Aladdin Scientific product datasheet. Do not store with strong oxidizing agents or strong acids.

Ordering Information and Product Specifications

1-(4-Ethylphenyl)thiourea is available from Aladdin Scientific under SKU E1071772. Researchers and procurement specialists are encouraged to contact Aladdin Scientific directly or visit the product page for the latest information on available pack sizes, purity grades, pricing, and lead times.

When placing an order, confirm that the required purity grade is suitable for your application — analytical-grade or synthesis-grade specifications may differ depending on whether the reagent is used as a reference standard, synthetic building block, or biological screening compound. Bulk quantities and custom purity options may be available upon request.

For technical questions about product specifications, certificates of analysis (CoA), or application support, contact the Aladdin Scientific technical support team through the official website.