Lyral is a colorless, viscous liquid with a sweet odor reminiscent of lily of the valley. The aldehyde can be prepared by a Diels–Alder reaction of myrcenol and acrolein in the presence of a Lewis catalyst (e.g., zinc chloride).
Reaction ofmyrcenol with acrolein at elevated temperatures, without a catalyst, yields a 70 : 30 mixture of the 4- and 3-substituted cyclohexene carboxaldehydes .This mixture is a commercial product. The title compound has excellent fixative properties and is used especially in soap and cosmetics perfumery：
Uses
hydroxyisohexyl 3-cyclohexene carboxaldehyde is fragrance with a light floral scent. It may cause skin irritation.
Uses
Lyral (mixture of isomers) is a suspected fragrance allergen.
Trade name
Lydocal (Hangzhou), Lyral® (IFF)
Contact allergens
Lyral ? is a synthetic blend of two isomers, and one of the most frequently encountered allergen in perfumes. It has to be listed by name in the ingredients of cosmet- ics in the EU, according to the seventh amendment of the cosmetic directive 76/768/EEC.
