2-Heptanol (systematically named heptan‑2‑ol) is an organic compound classified as a secondary alcohol. Its molecular formula is C₇H₁₆O, and it possesses a straight‑chain seven‑carbon backbone with a hydroxyl (‑OH) functional group attached to the second carbon atom. The compound is a colorless liquid at standard temperature and pressure, with a characteristic mild odor.
Physical and Chemical Properties
- Molecular weight: 116.22 g·mol⁻¹
- Density: approximately 0.81 g·cm⁻³ at 20 °C
- Boiling point: 159–160 °C (under 1 atm)
- Melting point: –95 °C (approximately)
- Solubility: Limited miscibility with water; readily soluble in organic solvents such as ethanol, ether, and acetone.
- Reactivity: As a secondary alcohol, 2‑heptanol can undergo typical alcohol reactions, including oxidation to the corresponding ketone (heptan‑2‑one) using oxidizing agents such as chromic acid or PCC, dehydration to produce heptenes under acidic conditions, and esterification with acids or acid derivatives.
Synthesis
Industrial or laboratory preparation of 2‑heptanol commonly proceeds via hydration of heptenes (especially 1‑heptene or 2‑heptene) in the presence of an acid catalyst, or through the reduction of heptan‑2‑one using metal hydride reagents (e.g., NaBH₄) or catalytic hydrogenation.
Applications
- Solvent: Utilized as a medium for organic reactions where moderate polarity is required.
- Intermediate: Serves as a precursor in the synthesis of fragrances, flavor compounds, and certain pharmaceuticals that incorporate a heptyl side chain.
- Research reagent: Employed in studies of reaction mechanisms involving secondary alcohols, as well as in the calibration of analytical techniques (e.g., gas chromatography).
Safety and Handling
2‑Heptanol is flammable and may pose irritation hazards. Safety data sheets recommend handling the compound in a well‑ventilated area, wearing appropriate personal protective equipment (gloves, goggles, lab coat), and storing it away from ignition sources. Acute exposure can cause skin and eye irritation; inhalation of vapors may cause respiratory discomfort.
Environmental Impact
The compound is biodegradable under aerobic conditions, but accidental releases should be minimized due to its potential toxicity to aquatic life at elevated concentrations.
Regulatory Status
2‑Heptanol is not classified as a controlled substance. Its usage in consumer products is regulated by standard chemical safety guidelines, and it may be subject to reporting thresholds in occupational exposure assessments.
References
- Lide, D. R. (Ed.). CRC Handbook of Chemistry and Physics, 102nd ed. CRC Press, 2021.
- National Center for Biotechnology Information. PubChem Compound Summary for CID 11770, 2‑Heptanol.
This entry reflects information available from established chemical literature and standard reference works as of the knowledge cutoff date.
