Chemical Identity and Structural Features

(1,5-Dimethyl-1H-pyrazol-3-yl)methanol (Aladdin SKU: D174515) consists of a five-membered pyrazole ring bearing a methyl substituent at N-1 and a methyl substituent at C-5, with a hydroxymethyl (–CH₂OH) group at C-3. The pyrazole ring is an aromatic heterocycle containing two adjacent nitrogen atoms, conferring hydrogen-bond-accepting capacity and moderate polarity to the molecule.

The primary alcohol functionality at C-3 distinguishes this compound as a synthetically flexible intermediate: it can act as a nucleophile, a leaving-group precursor (after activation), or an oxidizable handle toward the corresponding aldehyde or carboxylic acid. The N-methyl substitution at N-1 prevents N–H tautomerism, locking the regiochemistry of the ring and simplifying downstream chemistry.

Physicochemical Properties and Stability

As a small, polar heterocyclic alcohol, (1,5-dimethyl-1H-pyrazol-3-yl)methanol is expected to be a low-melting solid or viscous liquid at ambient temperature, with appreciable water solubility driven by the hydroxymethyl group and the basic pyrazole nitrogens. The compound is miscible with common polar organic solvents including methanol, ethanol, dimethyl sulfoxide (DMSO), and ethyl acetate.

The molecule is generally stable under ambient storage conditions when kept in a sealed container away from strong oxidants, strong acids, and sources of ignition. Because the primary alcohol can be slowly oxidized by atmospheric oxygen over extended periods, storage under inert atmosphere (nitrogen or argon) at 2–8 °C is recommended for long-term preservation. Verify exact melting point, boiling point, and molecular weight on the certificate of analysis (CoA) supplied with each lot.

Handling, Safety, and Storage Guidelines

Personal Protective Equipment (PPE): Wear appropriate PPE including nitrile gloves, laboratory coat, and safety glasses when handling this compound. Although pyrazole alcohols of this class are not classified as acutely highly toxic, skin and eye contact should be avoided. Work in a well-ventilated area or fume hood when handling in bulk quantities.

Storage: Store the compound in a tightly sealed vial or bottle at 2–8 °C, protected from light and moisture. For extended storage exceeding six months, consider dividing into single-use aliquots to minimize freeze-thaw cycles and atmospheric exposure. Always consult the Safety Data Sheet (SDS) provided with the product for hazard classification, first-aid measures, and disposal guidance before use.

Disposal: Dispose of waste material in accordance with local institutional, municipal, and national regulations for organic chemical waste. Do not pour solutions down the drain without verification of local ordinance compliance.

Synthetic Applications and Functionalization Strategies

(1,5-Dimethyl-1H-pyrazol-3-yl)methanol is widely employed in medicinal chemistry and materials research as a pyrazole-containing fragment for library synthesis and lead optimization. Key transformation strategies include:

• Oxidation to aldehyde/acid: The primary alcohol can be oxidized to the corresponding aldehyde using mild oxidants such as Dess-Martin periodinane (DMP) or Swern conditions, enabling access to pyrazole carboxaldehydes for reductive amination or Wittig reactions.
• Esterification and carbonate formation: Reaction with acyl chlorides or chloroformates under base (e.g., triethylamine) in dichloromethane gives ester or carbonate intermediates useful as prodrug linkers or protecting groups.
• Halogenation: Treatment with thionyl chloride (SOCl₂) or CBr₄/PPh₃ converts the alcohol to the corresponding chloro- or bromo-methyl pyrazole, which serves as an alkylating agent for nitrogen and oxygen nucleophiles.
• Metal-complex ligand assembly: The pyrazolylmethanol scaffold can coordinate to transition metals through the pyrazole nitrogen, making it a precursor to N,O-chelating ligands in catalysis research.

All reaction conditions should be optimized with small-scale trials before scale-up. Monitor reactions by TLC or HPLC to determine conversion and purity.

Quality, Purity, and Procurement Considerations

When procuring (1,5-dimethyl-1H-pyrazol-3-yl)methanol (D174515) from Aladdin Scientific, researchers should request the certificate of analysis (CoA) to verify lot-specific purity, identity (NMR, HPLC), and physical data. For sensitive synthetic applications, a purity of ≥95% (as assessed by HPLC or GC) is typically recommended as a minimum threshold.

Bulk quantities ordered for library synthesis benefit from a representative purity test on receipt, as moisture uptake or partial oxidation during shipping can affect downstream reaction yields. Dissolution in anhydrous DMSO followed by ¹H NMR confirmation is a simple in-house quality check. Contact Aladdin Scientific technical support for custom purity grades, larger pack sizes, or questions about specification documentation.