Δ-Valerolactone

Δ-Valerolactone is an organic compound and a lactone, specifically a five-membered ring compound. It is a colorless liquid with a fruity odor, and it is used in the flavor and fragrance industry.

Structure and Properties

Δ-Valerolactone is a cyclic ester, or lactone, with a five-membered ring structure. This ring structure is known as a γ-lactone due to the presence of a carbonyl group (C=O) and an ester group (-COO-) in the ring. The Δ symbol in its name indicates that the lactone ring is in the delta position, meaning it is attached to the fourth carbon atom in the chain.

The compound has a molecular formula of C5H8O2 and a molecular weight of 100.12 g/mol. It is a colorless liquid at room temperature, with a boiling point of 207-208 °C and a melting point of -30 °C. It is soluble in water and most organic solvents.

Uses

Δ-Valerolactone is used in the flavor and fragrance industry due to its fruity odor. It is also used as a solvent in various chemical reactions and as a monomer in the synthesis of polymers.

Synthesis

Δ-Valerolactone can be synthesized from levulinic acid, a compound derived from cellulose. The levulinic acid is first converted to α-angelica lactone, which is then hydrogenated to produce Δ-valerolactone.

Safety

Δ-Valerolactone is generally considered safe for use in the flavor and fragrance industry. However, like all chemicals, it should be handled with care to avoid skin and eye contact, and inhalation.

See Also

• Lactone
• Organic compound
• Levulinic acid
• Polymer