2Propen1ol

2‑Propen‑1‑ol, commonly known as allyl alcohol, is a simple unsaturated alcohol with the chemical formula C3H6O. Its molecular structure consists of a propene backbone bearing a hydroxyl group at the terminal carbon. The compound is a colorless liquid with a faint, sweet odor and is miscible with water as well as most organic solvents. Allyl alcohol has a boiling point around 97 °C and a density of 0.819 g cm⁻³ at 20 °C.

The substance is widely used as an intermediate in organic synthesis. It serves as a building block for fragrances, pharmaceuticals, and agrochemicals, and can be reacted with electrophiles to form functionalized allylic alcohols. It is also employed as a precursor to the synthesis of 1,3‑butadiene and various esters and epoxy resins.

Industrial production of allyl alcohol is typically achieved by hydroformylation of ethylene to butyraldehyde followed by reduction, or by catalytic hydroxylation of propylene. Purification often involves distillation and crystallization from suitable solvent systems.

Safety data indicate that allyl alcohol is flammable (flash point −30 °C) and can cause irritation to skin, eyes, and the respiratory tract. It is moderately toxic if swallowed or inhaled and may accumulate in adipose tissue due to its lipophilicity. Proper ventilation, protective gloves, and eye protection are recommended when handling.

Because of its reactivity and potential health hazards, the compound is regulated in many jurisdictions, and its transport and storage must comply with hazardous material guidelines.