Benzyl Benzoate BB Solvent
CAS# 120-51-4

Benzyl Benzoate, with CAS number 120-51-4 and chemical names such as benzyl benzenecarboxylate or phenylmethyl benzoate, is a widely used material available from both natural and synthetic sources. In nature, it occurs in Peru balsam (formerly referred to as Cinnamein), Tolu balsam, ylang-ylang essential oil, jasmine, and cinnamon. However, to meet commercial demand for high purity at lower cost, industry mainly produces it via esterification of benzyl alcohol and benzoic acid. Known since the 19th century, this material was first isolated from natural sources before chemists elucidated its ester structure and developed synthetic methods. In appearance, it is a viscous, oily liquid, colorless or very pale yellow, with a tendency to crystallize into flakes or white solid crystals when temperatures drop below 20°C. Beyond perfumery, benzyl benzoate also has a long medical history as one of the earliest effective treatments for scabies and lice, and it is still used today in topical preparations.

Description

Belonging to the balsamic/resinous odor group with a sweet family and a faint floral nuance, this material has a very mild scent-softly sweet and warm, sometimes reminiscent of almond or carrying a slight medicinal facet. With low intensity and limited diffusion, it rarely serves as a dominant odor, yet it shows good substantivity thanks to its low vapor pressure and high boiling point, functioning as a base-note material. Its most important role is as an excellent solvent for dissolving solid or highly viscous ingredients such as vanillin, resins, and formerly common nitro musks like musk ketone or musk xylol. Because it is itself a solvent, it is often used directly to dilute other materials rather than requiring an intermediate solvent. In addition, it can act as a fixative, slowing the evaporation of other components to improve lastingness, and as a modifier that rounds off and softens harsh edges in floral or spicy compositions. Although it is more functional than “artistic” and is not typically celebrated for creating signature accords, it is frequently paired with ylang-ylang or synthetic jasmine materials to more faithfully reproduce the natural composition of these flowers.

Applications

The uses of benzyl benzoate extend from perfumery-where it serves as a solvent and fixative-to food flavoring (for fruity and chewing-gum notes), as well as pharmaceuticals and industrial products such as soaps and scented candles to help stabilize fragrance. Usage levels in perfume formulas are very flexible, ranging from around 1% to over 20% if used as a primary solvent, but the concentration in the finished product is always limited by IFRA standards. From a safety perspective, it is listed among the EU’s 26 fragrance allergens and must be declared on labels if it exceeds 0.001% in leave-on products and 0.01% in rinse-off products. In neat form, it may irritate eyes and skin and can be harmful if large amounts are swallowed. Users should store it in a cool, dry, well-ventilated place, and gently warm it to re-liquefy if it solidifies in cold weather. In the market, many classic floral and oriental perfumes contain this material. Examples include Guerlain L’Heure Bleue and Shalimar, which use it as a solvent and fixative for substantial amounts of resins and musks, and Chanel No. 5, which incorporates it as part of its jasmine and ylang-ylang floral complex. Finally, in entry 326 of Perfume and Flavor Chemicals, expert Steffen Arctander described benzyl benzoate as a colorless, oily liquid that is insoluble in water but soluble in alcohol and oils, with a mildly sweet balsamic odor. He particularly emphasized its functional role, stating that it is widely used in perfumery as a fixative, blending agent, and an excellent solvent for nitro musks, synthetic musks, and labdanum resinoid.