Overview
(S)-1-Phenylethanol is an enantiomerically pure chiral alcohol that serves as a fundamental building block in asymmetric synthesis. As part of the secondary alcohol family, it features a stereocenter at the α-carbon, making it valuable for producing optically active compounds. The (S)-configuration is particularly significant in pharmaceutical manufacturing where specific stereochemistry is required for drug efficacy. Industrial production typically involves asymmetric reduction of acetophenone or kinetic resolution of racemic mixtures. Its high enantioselectivity (often >99% ee) and stability under various reaction conditions have established it as a preferred chiral auxiliary in fine chemical synthesis.
Physical and Chemical Properties
The compound exhibits characteristic physical properties of aromatic alcohols, including moderate volatility and a faint floral odor. Its optical rotation of −45° (neat) serves as a key identifier for quality control. The hydroxyl group enables typical alcohol reactions like esterification and oxidation, while the phenyl ring allows electrophilic aromatic substitutions. Chemically, (S)-1-Phenylethanol demonstrates stability under anhydrous conditions but may racemize in strongly acidic or basic environments. Its partition coefficient (log P ≈ 1.4) indicates moderate lipophilicity, influencing solubility in organic solvents. The compound’s vapor pressure (0.1 mmHg at 20°C) warrants proper ventilation during handling.
Main Applications
In pharmaceuticals, (S)-1-Phenylethanol functions as a chiral intermediate for β-blockers, antidepressants, and antiviral drugs. Its ability to induce stereoselectivity makes it indispensable in asymmetric hydrogenations and enzyme-mediated transformations. The fragrance industry utilizes its mild rose-like aroma in perfumes and flavor compositions. As a resolving agent, it effectively separates racemic acids via diastereomeric salt formation. Recent applications include use in liquid crystals and as a ligand in transition metal catalysis. The electronics sector employs it in chiral dopants for LCD materials, where optical purity directly impacts performance.
Safety and Storage
Classified as a Category 3 flammable liquid, (S)-1-Phenylethanol requires storage in tightly sealed containers with inert gas padding when appropriate. Incompatible with strong oxidizers and acids, it should be kept in corrosion-resistant cabinets at temperatures below 30°C. Secondary containment is recommended for bulk quantities. Personal protective equipment including chemical-resistant gloves (nitrile recommended) and splash goggles should be used. Spills should be absorbed with inert material and disposed as hazardous waste. Proper grounding is essential during transfer due to electrostatic accumulation risk (resistivity: 3.6 × 10^7 Ω·cm).
B2B Procurement Guide
Industrial buyers should prioritize suppliers who provide comprehensive certificates of analysis including chiral HPLC traces, residual solvent profiles, and water content. Pharmaceutical-grade material typically requires ≥99% chemical purity and ≥99.5% enantiomeric excess. Bulk shipments (drum quantities) often offer 15-30% cost savings compared to lab-scale packaging. Just-in-time procurement is advisable due to potential racemization during prolonged storage. Quality verification through independent chiral GC or polarimetry is recommended upon receipt. For continuous supply, consider dual sourcing from manufacturers in China and Europe to mitigate supply chain risks.
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