Overview
Methylpentynol (MP) is a tertiary alcohol with the chemical formula C6H10O, first synthesized in the mid-20th century. Initially explored for its sedative effects, it is now predominantly used as an intermediate in pharmaceutical and fine chemical synthesis. Its structure features a triple bond adjacent to a hydroxyl group, contributing to its reactivity. As a volatile liquid, MP requires careful handling due to flammability. Industrial-grade MP typically exceeds 98% purity, with impurities monitored to avoid interference in downstream reactions. Regulatory classifications vary by region, often requiring hazard labeling under GHS standards.
Physical and Chemical Properties
MP exhibits a density of 0.87 g/cm³ and boiling point of 121–122°C, making it suitable for reactions at moderate temperatures. Its solubility in polar (water, ethanol) and non-polar solvents (ether) enables versatile application in multi-phase systems. The compound’s hygroscopic nature necessitates airtight storage to prevent moisture absorption. Key reactivity includes nucleophilic addition at the alkyne group and dehydration under acidic conditions. MP’s flammability (flash point ~30°C) mandates explosion-proof equipment during large-scale processing. Thermal stability tests show decomposition above 200°C, releasing carbon oxides.
Main Applications
In pharmaceuticals, MP serves as a precursor for anxiolytics and muscle relaxants, though its direct medicinal use has declined due to newer alternatives. It is integral to synthesizing complex molecules like vitamin E analogs and chiral ligands for asymmetric catalysis. Industrial applications include corrosion inhibitors for metalworking fluids and stabilizers for chlorinated solvents. Specialty chemical manufacturers value MP for introducing alkynyl groups into polymers, enhancing material properties like UV resistance. Niche uses encompass fragrance intermediates due to its mild, sweet odor.
Safety and Storage
MP requires hazard communication per OSHA 29 CFR 1910.1200, including GHS pictograms for flammability (GHS02) and health hazards (GHS07). Ventilation should maintain airborne concentrations below 50 mg/m³ (8-hour TWA). Spills must be contained with inert absorbents like vermiculite, avoiding water spray to prevent vapor dispersion. Storage drums (HDPE or stainless steel) should be grounded to prevent static discharge. Incompatible materials include strong oxidizers and acids. First aid measures for eye contact involve 15-minute irrigation; skin exposure requires soap washing. Firefighting requires alcohol-resistant foam.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with REACH/OSHA compliance documentation and batch-specific COAs analyzing purity (GC/HPLC), water content (<0.5%), and residual catalysts. Just-in-time procurement minimizes storage risks, with optimal order quantities aligning with production schedules. Logistics require UN-certified packaging (e.g., UN 1993 Class 3) for ground transport. For global sourcing, verify whether the supplier holds Responsible Care certification. Contract manufacturing options are available for custom derivatization (e.g., MP ethers), typically requiring MOQs of 500 kg.
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