Methyl Beta Napthyl Ketone alt. Oranger Crystals Aroma Chemical
CAS# 93-08-3

2-Acetylnaphthalene (CAS number: 93-08-3), also widely known in the industry as Methyl beta-naphthyl ketone, 2-Acetonaphthone, or Oranger Crystals, is a highly valuable synthetic aromatic ketone used in the fragrance and cosmetic industries. At room temperature, this compound exists as a crystalline solid, fine powder, or crystal blocks ranging in color from white to light yellow. 2-Acetylnaphthalene is typically synthesized through the Friedel-Crafts acylation of naphthalene using acetyl chloride or acetic anhydride in the presence of an aluminum chloride catalyst. Thanks to its stable physicochemical properties, it plays a core role in creating and enhancing sophisticated fragrance products.

The most prominent feature of 2-Acetylnaphthalene is its highly complex, luxurious, and captivating scent structure. It possesses a sweet, warm floral odor with powdery nuances and distinctive notes of orange blossom and neroli. It offers a soft and round sensory experience that combines facets of hawthorn, almond, and balsamic notes. In the food and flavor industry, it is also utilized as a flavoring agent to impart a sweet, fruity taste reminiscent of cherry, almond, and balsam.

Due to its high tenacity and excellent stability, particularly its resistance to alkaline environments, this compound is extensively used as a fixative and floral fragrance agent in perfumes, eau de cologne, soaps, laundry detergents, and various cosmetics. It frequently appears in cosmetic-powder formulations, classic aldehyde florals, or serves as a signature base note for ylang-ylang and other floral accords. Furthermore, this compound is applied as an intermediate in the synthesis of pharmaceuticals, such as anti-inflammatory and antifungal drugs.

Technically, 2-Acetylnaphthalene has the molecular formula C12H10O, a melting point around 53-56°C, and is insoluble in water and glycerin but dissolves well in organic solvents, alcohol, and fixed oils. Although it is recognized as safe (GRAS) by reputable organizations like JECFA and the FDA when used as a food flavoring additive, its use in cosmetics and perfumes is strictly regulated by the International Fragrance Association (IFRA). Specifically, the maximum allowable concentration in finished products that come into contact with the skin (such as body lotions, fine fragrances, and deodorants) is capped at 0.2% due to the risk of phototoxicity. During manufacturing and handling, users must wear protective equipment because the pure chemical form can cause eye and skin irritation (H315, H319), is harmful if swallowed (H302), and exhibits long-term toxicity to aquatic environments (H411).