Overview
L-Citronellol is the levorotatory enantiomer of citronellol, a naturally occurring acyclic monoterpene alcohol. It is found in essential oils of rose, geranium, and citronella, and is valued for its characteristic floral-rosy scent. The compound's chiral nature makes it particularly important in high-end fragrance formulations where stereochemistry affects odor profile. Industrially, L-Citronellol is produced both through isolation from plant sources and chemical synthesis. The synthetic route often involves the hydrogenation of geraniol or nerol, followed by chiral separation techniques. Its global market demand is primarily driven by the perfume and flavor industries, where enantiomeric purity significantly impacts product quality.
Physical and Chemical Properties
As a liquid at room temperature, L-Citronellol exhibits typical alcohol properties with moderate viscosity. Its refractive index ranges between 1.455-1.462 at 20°C, and it shows optical rotation of approximately -5° to -6° (neat). The compound is stable under normal conditions but may oxidize upon prolonged exposure to air. The molecular structure features a tertiary alcohol group and an isoprene-derived carbon skeleton, contributing to both its solubility characteristics and reactivity. L-Citronellol undergoes typical alcohol reactions including esterification and ether formation, while the double bond allows for hydrogenation or epoxidation. Its vapor pressure is relatively low (0.03 mmHg at 20°C), making it suitable for long-lasting fragrance applications.
Main Applications
In perfumery, L-Citronellol serves as a key ingredient in rose-type fragrances, constituting up to 30-40% of certain rose oil reconstructions. Its stability and compatibility with other fragrance compounds make it valuable for soaps, detergents, and fine perfumes. The cosmetic industry utilizes it as a fragrance component in skincare products and as a natural preservative booster. Flavor applications include fruit flavors (especially citrus and berry notes) at low concentrations (10-100 ppm). The compound also finds use in insect repellent formulations, often synergized with citronellal. Emerging applications include pheromone synthesis and as a chiral building block in pharmaceutical intermediates, where its specific rotation is critical.
Safety and Storage
L-Citronellol is generally recognized as safe (GRAS) for food use at low levels, but requires proper handling in industrial settings. It is classified as a Category 4 skin irritant (H315) and should be stored in tightly sealed stainless steel or aluminum containers to prevent oxidation. Recommended storage temperature is below 30°C. Fire safety measures include using alcohol-resistant foam for extinguishing and avoiding contact with strong oxidizers. In laboratory or production environments, local exhaust ventilation is advised when handling heated material. The compound is biodegradable (OECD 301F >60% in 28 days) and not considered persistent in the environment.
B2B Procurement Guide
When sourcing L-Citronellol, buyers should specify required enantiomeric purity (typically 90-99% ee for fragrance use). Technical grade (80-90% purity) suffices for some industrial applications, while pharmaceutical grades demand higher specifications. Key quality indicators include optical rotation, refractive index, and gas chromatography purity profiles. Bulk purchasing (drum quantities or larger) typically offers 15-30% cost savings versus small packaging. Lead times vary seasonally due to agricultural sourcing components. For international shipments, proper classification as a flammable liquid (UN 1987, PG III) is required. Reputable suppliers provide certificates of analysis including chiral HPLC data and residual solvent profiles.
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